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			$ 25,000,000.0
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	88.00%	73.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Walmart [Member]
Concentration Risk, Percentage	43.00%	42.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Amazon [Member]
Concentration Risk, Percentage	28.00%	12.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Fred Meyer [Member]
Concentration Risk, Percentage	17.00%	19.00%
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			48.00%	43.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member]
Concentration Risk, Percentage	25.00%			35.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Three [Member]
Concentration Risk, Percentage	20.00%			11.00%
Product Concentration Risk [Member] | Revenue, Product and Service Benchmark [Member] | Microwave Ovens [Member]
Concentration Risk, Percentage	36.00%	42.00%
Product Concentration Risk [Member] | Revenue, Product and Service Benchmark [Member] | Audio Products [Member]
Concentration Risk, Percentage	60.00%	57.00%
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	100.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Largest Supplier [Member]
Concentration Risk, Percentage	57.00%	76.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier One [Member]
Concentration Risk, Percentage	22.00%	24.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Two [Member]
Concentration Risk, Percentage	21.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Two Largest Factory Suppliers [Member]
Concentration Risk, Percentage		100.00%