Note 8 - Concentration Risk (Details Textual) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
Jun. 30, 2023 USD ($) | Jun. 30, 2022 | Dec. 31, 2022 | Mar. 31, 2023 USD ($) |
Cash, Uninsured Amount | $ 24,400,000 | | | $ 25,000,000 |
Maximum [Member] | | | | |
Cash, FDIC Insured Amount | $ 250,000 | | | |
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 | 88% | 73% | | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Walmart [Member] | | | | |
Concentration Risk, Percentage | 43% | 42% | | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Amazon [Member] | | | | |
Concentration Risk, Percentage | 28% | 12% | | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Fred Meyer [Member] | | | | |
Concentration Risk, Percentage | 17% | 19% | | |
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 | 25% | | | 35% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Three [Member] | | | | |
Concentration Risk, Percentage | 20% | | | 11% |
Product Concentration Risk [Member] | Revenue, Product and Service Benchmark [Member] | Microwave Ovens [Member] | | | | |
Concentration Risk, Percentage | 36% | 42% | | |
Product Concentration Risk [Member] | Revenue, Product and Service Benchmark [Member] | Audio Products [Member] | | | | |
Concentration Risk, Percentage | 60% | 57% | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | | | | |
Number of Factory Suppliers | 3 | 2 | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Three Largest Factory Suppliers [Member] | | | | |
Concentration Risk, Percentage | 100% | | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Largest Supplier [Member] | | | | |
Concentration Risk, Percentage | 57% | 76% | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier One [Member] | | | | |
Concentration Risk, Percentage | 22% | 24% | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Two [Member] | | | | |
Concentration Risk, Percentage | 21% | | | |
Supplier Concentration Risk [Member] | Products for Resale [Member] | Two Largest Factory Suppliers [Member] | | | | |
Concentration Risk, Percentage | | 100% | | |