Note 7 - Debt (Details Textual) | | | | | | | 1 Months Ended | 3 Months Ended | 9 Months Ended | 47 Months Ended | | | | | | |
Sep. 16, 2024 USD ($) | Jul. 17, 2024 USD ($) | Apr. 01, 2024 USD ($) | Jan. 09, 2024 USD ($) $ / shares | Feb. 10, 2023 $ / shares | Feb. 01, 2019 USD ($) | May 31, 2021 USD ($) shares | Feb. 28, 2018 USD ($) $ / shares | Sep. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Mar. 28, 2024 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2016 USD ($) | Jul. 17, 2029 | Dec. 31, 2023 USD ($) | Jan. 31, 2023 USD ($) | Feb. 28, 2019 USD ($) | Nov. 30, 2015 USD ($) | Jan. 31, 2013 |
Proceeds from Convertible Debt | | | | | | | | | | | | $ 230,000,000 | $ 0 | | | | | | | |
Stock Repurchased During Period, Value | | | | $ 50,000,000 | | | | | $ 23,759,000 | | | 73,759,000 | | | | | | | | |
Shares Acquired, Average Cost Per Share (in dollars per share) | $ / shares | | | | $ 0.9067 | | | | | | | | | | | | | | | | |
Repayments of Convertible Debt | | | | | | | | | | | | 4,881,000 | 0 | | | | | | | |
Long-Term Debt | | | | | | | | | 440,974,000 | | | 440,974,000 | | | | $ 249,345,000 | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | | | | $ 30,013,000 | | | 30,013,000 | | | | | | | | |
Repayments of Lines of Credit | | | | | | | | | | | | $ 465,301,000 | $ 519,597,000 | | | | | | | |
Conversion of the 2025 Notes into Common Stock [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Original Debt, Amount | | | | | | | $ 55,400,000 | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares | | | | | | | 19,051,270 | | | | | | | | | | | | | |
Line of Credit [Member] | | | | | | | | | | | | | | | | | | | | |
Debt, Weighted Average Interest Rate | | | | | | | | | 5.40% | | | 5.40% | | | | 7.50% | | | | |
Minimum [Member] | | | | | | | | | | | | | | | | | | | | |
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate | | | | | | | | | 0.70% | | | 0.70% | | | | | | | | |
Maximum [Member] | | | | | | | | | | | | | | | | | | | | |
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate | | | | | | | | | 4.50% | | | 4.50% | | | | | | | | |
The 2044 Notes [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | $ 250,000,000 | | | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | 7.50% | | | | | | | | | | | | | | | | | | |
Debt Instrument, Repayment Fee, Percent | | 3% | | | | | | | | | | | | | | | | | | |
Debt Instrument, Early Extinguishment, Percent of Principal Amount | | 150% | | | | | | | | | | | | | | | | | | |
Debt Instrument, Repayment Fee, Royalty Percentage | | 80% | | | | | | | | | | | | | | | | | | |
Debt Instrument, Additional Authorized Amount | | $ 50,000,000 | | | | | | | | | | | | | | | | | | |
Long-Term Debt | | | | | | | | | $ 245,358,000 | | | $ 245,358,000 | | | | $ 0 | | | | |
The 2044 Notes [Member] | Forecast [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Early Extinguishment, Percent of Principal Amount | | | | | | | | | | | | | | | 200% | | | | | |
The 2044 Notes [Member] | Minimum [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | 4% | | | | | | | | | | | | | | | | | | |
The 2029 Convertible Notes 1 [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | $ 230,000,000 | | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | 3.75% | | | | | | | | | | | | | | | | |
Proceeds from Convertible Debt | | | | $ 222,000,000 | | | | | | | | | | | | | | | | |
Debt Instrument, Repurchase Amount | | | | | | | | | 3,500,000 | | | 3,500,000 | | | | | | | | |
Embedded Derivative, Fair Value of Embedded Derivative Liability | | | | $ 125,600,000 | | | | | | | | | | | | | | | | |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | | | | | | | | | | | $ 26,250,000 | | | | | | | | | |
Embedded Derivative, No Longer Bifurcated, Amount Reclassified to Stockholders' Equity | | | $ 151,900,000 | | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Ratio | | | | 869.5652 | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares | | | | $ 1.15 | | | | | | | | | | | | | | | | |
Debt Instrument, Sinking Fund Payment | | | | $ 0 | | | | | | | | | | | | | | | | |
Debt Instrument, Redemption Price, Percentage | | | | 100% | | | | | | | | | | | | | | | | |
Repayments of Convertible Debt | | | | | | | | | 4,800,000 | | | | | | | | | | | |
Gain (Loss) on Repurchase of Debt Instrument | | | | | | | | | 32,000 | | | | | | | | | | | |
Write-off of Unamortized Discount | | | | | | | | | 1,300,000 | | | | | | | | | | | |
Deferred Debt Issuance Cost, Writeoff | | | | | | | | | 100,000 | | | | | | | | | | | |
The 2029 Convertible Notes 1 [Member] | Convertible Debt [Member] | | | | | | | | | | | | | | | | | | | | |
Proceeds from Issuance of Debt | | | | $ 146,300,000 | | | | | | | | | | | | | | | | |
The 2029 Convertible Notes 1 [Member] | Debt Instrument, Redemption, Period One [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Threshold Trading Days | | | | 20 | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | | | | 30 | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | | | | 130% | | | | | | | | | | | | | | | | |
The 2029 Convertible Notes 1 [Member] | Debt Instrument, Redemption, Period Two [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Threshold Trading Days | | | | 5 | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | | | | 10 | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | | | | 98% | | | | | | | | | | | | | | | | |
The 2029 Convertible Notes 1 [Member] | Scenario, Event of Default [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Redemption Price, Percentage | | | | 100% | | | | | | | | | | | | | | | | |
Debt Instrument, Ownership Interest | | | | 25% | | | | | | | | | | | | | | | | |
The 2029 Convertible Affiliate Notes [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | $ 71,100,000 | | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | 3.75% | | | | | | | | | | | | | | | | |
The 2029 Convertible Affiliate Notes [Member] | Convertible Debt [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | $ 71,100,000 | | | | | | | | | | | | | | | | |
The 2023 Convertible Notes [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Repurchase Amount | | | | 55,000,000 | | | | | | | | | | | | | | | | |
Interest Payable | | | | 16,100,000 | | | | | | | | | | | | | | | | |
Convertible Debt | | | | 0 | | | | | | | | | | | | | | | | |
Long-Term Debt | | | | | | | | | 0 | | | 0 | | | | 71,025,000 | | | | |
The 2023 Convertible Notes [Member] | Convertible Debt [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | 55,000,000 | | | | $ 55,000,000 | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | 5% | | | | | | | | | | | | |
Interest Payable | | | | 16,100,000 | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares | | | | | | | | $ 5 | | | | | | | | | | | | |
Debt Instrument, Term (Year) | | | | | | | | 5 years | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Premium, Percent | | | | | 25% | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Premium, Per Share (in dollars per share) | $ / shares | | | | | $ 1.66 | | | | | | | | | | | | | | | |
The 2025 Notes [Member] | Convertible Debt [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | 170,000 | | | | | | | | | | | | | | | | |
Debt Instrument, Repurchase Amount | | | | $ 144,400,000 | | | | | | | | | | | | | | | | |
The 2025 Notes [Member] | Debt Instrument, Redemption, Period One [Member] | Convertible Debt [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | | | | | | 30 | | | | | | | | | | | | | | |
The 2025 Notes [Member] | Scenario, Event of Default [Member] | Convertible Debt [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | | | | | | | | | | | | $ 200,000,000 | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | | | | | | | | 4.50% | | |
The 2033 Senior Notes [Member] | | | | | | | | | | | | | | | | | | | | |
Long-Term Debt | | | | | | | | | $ 50,000 | | | $ 50,000 | | | | 50,000 | | | | |
The 2033 Senior Notes [Member] | Convertible Debt [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Repurchase Amount | | | | | | $ 28,800,000 | | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Amount | | | | | | | | | | | | | | $ 143,200,000 | | | | | | |
Repayments of Debt | | | | | | | | | | $ 3,000,000 | | | | | | | | | | |
Long-Term Debt | | | | | | | | | | $ 50,600 | | | | | | | | | | |
The 2033 Senior Notes [Member] | Senior Notes [Member] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | | | | | | | | | | | $ 175,000,000 | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | | | | | | | | | | 3% |
Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | | | | | | | | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | | | | | | | | | | | | | | $ 50,000,000 | |
Repayments of Lines of Credit | $ 9,700,000 | | | | | | | | | | | | | | | | | | | |
Long-Term Line of Credit, Noncurrent | | | | | | | | | | | | | | | | $ 12,700,000 | | | | |
Credit Agreement [Member] | Line of Credit [Member] | Bridge Loan [Member] | | | | | | | | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | | | | | | | | | | | | | | 20,000,000 | |
Credit Agreement [Member] | Line of Credit [Member] | Letter of Credit [Member] | | | | | | | | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | | | | | | | | | | | | | | $ 20,000,000 | |
Notes and Other Debt [Member] | | | | | | | | | | | | | | | | | | | | |
Debt, Weighted Average Interest Rate | | | | | | | | | 1.80% | | | 1.80% | | | | 2.90% | | | | |