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Note 12 - Risks and Uncertainties (Details Textual) |  | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($)
Accounts Receivable, Allowance for Credit Loss, Current | $ 25,000 | $ 25,000 |
Cash, Uninsured Amount | $ 19,600,000 | $ 19,600,000 | $ 25,000,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |
Number of Customers |  | 3 | 3
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Three Largest Customers [Member] |  |  |
Concentration Risk, Percentage |  | 83.00% | 77.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Walmart [Member] |  |  |
Concentration Risk, Percentage |  | 53.00% | 42.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Amazon [Member] |  |  |
Concentration Risk, Percentage |  | 20.00% | 23.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Fred Meyer [Member] |  |  |
Concentration Risk, Percentage |  | 10.00% | 12.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Walmart [Member] |  |  |
Concentration Risk, Percentage |  | 34.00% | 35.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Amazon [Member] |  |  |
Concentration Risk, Percentage |  | 25.00% | 43.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Fred Meyer [Member] |  |  |
Concentration Risk, Percentage |  |  | 11.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Chedraui [Member] |  |  |
Concentration Risk, Percentage |  | 30.00% |
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Microwave Ovens [Member] |  |  |
Concentration Risk, Percentage |  | 33.00% | 27.00%
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Audio Products [Member] |  |  |
Concentration Risk, Percentage |  | 66.00% | 73.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] |  |  |
Number of Factory Suppliers |  |  | 2
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier One [Member] |  |  |
Concentration Risk, Percentage | 38.00% | 75.00% | 75.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Two Largest Factory Suppliers [Member] |  |  |
Concentration Risk, Percentage |  |  | 95.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Two [Member] |  |  |
Concentration Risk, Percentage |  |  | 20.00%
Sales Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |
Number of Sales Representative Organizations |  | 6 | 2
Sales Concentration Risk [Member] | Revenue Benchmark [Member] | Sales Representative Organizations One [Member] |  |  |
Concentration Risk, Percentage |  | 30.00% | 38.00%

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