Note 8 - Concentration Risk (Details Textual) $ in Millions	3 Months Ended		9 Months Ended
Note 8 - Concentration Risk (Details Textual) $ in Millions	Dec. 31, 2024 USD ($)	Dec. 31, 2023	Dec. 31, 2024 USD ($)	Dec. 31, 2023	Mar. 31, 2024 USD ($)
Cash, Uninsured Amount	$ 0.4		$ 0.4		$ 19.6
Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Number of Customers	3	2	3	3
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Microwave Ovens [Member]
Concentration Risk, Percentage	53.00%	22.00%	49.00%	28.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Audio Products [Member]
Concentration Risk, Percentage	46.00%	76.00%	49.00%	70.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Three Largest Customers [Member]
Concentration Risk, Percentage	92.00%		82.00%	89.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Amazon [Member]
Concentration Risk, Percentage	43.00%	19.00%	38.00%	21.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Walmart [Member]
Concentration Risk, Percentage	25.00%	65.00%	33.00%	58.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Big Lots [Member]
Concentration Risk, Percentage	24.00%		11.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Two Largest Customers [Member]
Concentration Risk, Percentage		84.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Fred Meyer [Member]
Concentration Risk, Percentage				10.00%
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			52.00%	34.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer Two [Member]
Concentration Risk, Percentage			27.00%	30.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer Three [Member]
Concentration Risk, Percentage			10.00%	25.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member]
Number of Customers		3	5	4
Number of Factory Suppliers	4
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Four Largest Factory Suppliers [Member]
Concentration Risk, Percentage	94.00%			93.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Supplier One [Member]
Concentration Risk, Percentage	46.00%	37.00%	41.00%	29.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Supplier Two [Member]
Concentration Risk, Percentage	22.00%	28.00%	19.00%	26.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Supplier Three [Member]
Concentration Risk, Percentage	15.00%	21.00%	12.00%	23.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Supplier Four [Member]
Concentration Risk, Percentage	11.00%		11.00%	15.00%
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] \| Five Largest Factory Suppliers [Member]
Concentration Risk, Percentage			94.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Supplier Five [Member]
Concentration Risk, Percentage			11.00%