Note 8 - Concentration Risk (Details Textual)	3 Months Ended		9 Months Ended		12 Months Ended
Note 8 - Concentration Risk (Details Textual)	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	84.00%	84.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Walmart [Member]
Concentration Risk, Percentage	65.00%	50.00%	58.00%	42.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Amazon [Member]
Concentration Risk, Percentage	19.00%	34.00%	21.00%	21.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Three Largest Customers [Member]
Concentration Risk, Percentage			89.00%	74.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Fred Meyer [Member]
Concentration Risk, Percentage			10.00%	11.00%
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			20.00%		35.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer Three [Member]
Concentration Risk, Percentage			15.00%		11.00%
Product Concentration Risk [Member] \| Revenue Benchmark [Member] \| Microwave Ovens [Member]
Concentration Risk, Percentage	22.00%	9.00%	28.00%	24.00%
Product Concentration Risk [Member] \| Revenue Benchmark [Member] \| Audio Products [Member]
Concentration Risk, Percentage	76.00%	91.00%	70.00%	75.00%
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	86.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Largest Supplier [Member]
Concentration Risk, Percentage	37.00%	74.00%	29.00%	71.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Supplier One [Member]
Concentration Risk, Percentage	28.00%	21.00%	26.00%	28.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Supplier Two [Member]
Concentration Risk, Percentage	21.00%		23.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Two Largest Factory Suppliers [Member]
Concentration Risk, Percentage		95.00%		99.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Four Largest Factory Suppliers [Member]
Concentration Risk, Percentage			93.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Supplier Three [Member]
Concentration Risk, Percentage			15.00%