Note 8 - Concentration Risk (Details Textual) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
Dec. 31, 2023 USD ($) | Dec. 31, 2022 | Dec. 31, 2023 USD ($) | Dec. 31, 2022 | Mar. 31, 2023 USD ($) |
Cash, Uninsured Amount | $ 3,400,000 | | $ 3,400,000 | | $ 25,000,000 |
Maximum [Member] | | | | | |
Cash, FDIC Insured Amount | $ 250,000 | | $ 250,000 | | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | | | | | |
Number of Customers | 2 | 2 | 3 | 3 | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Largest Customers [Member] | | | | | |
Concentration Risk, Percentage | 84% | 84% | | | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Walmart [Member] | | | | | |
Concentration Risk, Percentage | 65% | 50% | 58% | 42% | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Amazon [Member] | | | | | |
Concentration Risk, Percentage | 19% | 34% | 21% | 21% | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Three Largest Customers [Member] | | | | | |
Concentration Risk, Percentage | | | 89% | 74% | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Fred Meyer [Member] | | | | | |
Concentration Risk, Percentage | | | 10% | 11% | |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | | | | | |
Number of Customers | | | 3 | | 3 |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member] | | | | | |
Concentration Risk, Percentage | | | 48% | | 43% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member] | | | | | |
Concentration Risk, Percentage | | | 20% | | 35% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Three [Member] | | | | | |
Concentration Risk, Percentage | | | 15% | | 11% |
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Microwave Ovens [Member] | | | | | |
Concentration Risk, Percentage | 22% | 9% | 28% | 24% | |
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Audio Products [Member] | | | | | |
Concentration Risk, Percentage | 76% | 91% | 70% | 75% | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | | | | | |
Number of Factory Suppliers | 3 | 2 | 4 | 2 | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Three Largest Factory Suppliers [Member] | | | | | |
Concentration Risk, Percentage | 86% | | | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Largest Supplier [Member] | | | | | |
Concentration Risk, Percentage | 37% | 74% | 29% | 71% | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier One [Member] | | | | | |
Concentration Risk, Percentage | 28% | 21% | 26% | 28% | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Two [Member] | | | | | |
Concentration Risk, Percentage | 21% | | 23% | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Two Largest Factory Suppliers [Member] | | | | | |
Concentration Risk, Percentage | | 95% | | 99% | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Four Largest Factory Suppliers [Member] | | | | | |
Concentration Risk, Percentage | | | 93% | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Three [Member] | | | | | |
Concentration Risk, Percentage | | | 15% | | |