Note 8 - Concentration Risk (Details Textual) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Mar. 31, 2024 USD ($) |
Cash, Uninsured Amount | $ 200,000 | | $ 200,000 | | $ 19,600,000 |
Maximum [Member] | | | | | |
Cash, FDIC Insured Amount | | $ 250,000 | | $ 250,000 | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | | | | | |
Number of Customers | 3 | 3 | 3 | 3 | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Microwave Ovens [Member] | | | | | |
Concentration Risk, Percentage | 43% | 27% | 45% | 32% | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Audio Products [Member] | | | | | |
Concentration Risk, Percentage | | 70% | 52% | 66% | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Three Largest Customers [Member] | | | | | |
Concentration Risk, Percentage | 86% | 90% | 84% | 89% | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Walmart [Member] | | | | | |
Concentration Risk, Percentage | 42% | 60% | 39% | 53% | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Amazon [Member] | | | | | |
Concentration Risk, Percentage | 31% | 19% | 34% | 22% | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Fred Meyer [Member] | | | | | |
Concentration Risk, Percentage | 13% | 11% | 11% | 14% | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Audio Products [Member] | | | | | |
Concentration Risk, Percentage | 55% | | | | |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | | | | | |
Number of Customers | | | 4 | | 3 |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member] | | | | | |
Concentration Risk, Percentage | | | 42% | | 34% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member] | | | | | |
Concentration Risk, Percentage | | | 23% | | 30% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Three [Member] | | | | | |
Concentration Risk, Percentage | | | 16% | | 25% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Four [Member] | | | | | |
Concentration Risk, Percentage | | | 14% | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | | | | | |
Number of Customers | | 3 | 5 | | |
Number of Factory Suppliers | 4 | | | 3 | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Largest Supplier [Member] | | | | | |
Concentration Risk, Percentage | | 34% | 38% | 39% | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier One [Member] | | | | | |
Concentration Risk, Percentage | | 31% | 19% | 24% | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Three [Member] | | | | | |
Concentration Risk, Percentage | | 15% | 16% | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Five Largest Factory Suppliers [Member] | | | | | |
Concentration Risk, Percentage | | | 100% | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Two [Member] | | | | | |
Concentration Risk, Percentage | | | 17% | 17% | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Four [Member] | | | | | |
Concentration Risk, Percentage | | | 10% | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Three Largest Factory Suppliers [Member] | | | | | |
Concentration Risk, Percentage | | | | 80% | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Four Largest Factory Suppliers [Member] | | | | | |
Concentration Risk, Percentage | 91% | | | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Largest Supplier [Member] | | | | | |
Concentration Risk, Percentage | 47% | | | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier One [Member] | | | | | |
Concentration Risk, Percentage | 16% | | | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Two [Member] | | | | | |
Concentration Risk, Percentage | 16% | | | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Three [Member] | | | | | |
Concentration Risk, Percentage | 12% | | | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Three Largest Factory Suppliers [Member] | | | | | |
Concentration Risk, Percentage | | 80% | | | |