Note 12 - Risks and Uncertainties (Details Textual)	12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
Statement [Line Items]
Accounts Receivable, Allowance for Credit Loss, Current	$ 25,000	$ 4,000
Cash, Uninsured Amount	$ 25,000,000.0	$ 25,300,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Statement [Line Items]
Number of Customers	3	3
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Three Largest Customers [Member]
Statement [Line Items]
Concentration Risk, Percentage	77.00%	90.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Walmart [Member]
Statement [Line Items]
Concentration Risk, Percentage	42.00%	45.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Amazon [Member]
Statement [Line Items]
Concentration Risk, Percentage	23.00%	32.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Fred Meyer [Member]
Statement [Line Items]
Concentration Risk, Percentage	12.00%	13.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Walmart [Member]
Statement [Line Items]
Concentration Risk, Percentage	35.00%	69.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Amazon [Member]
Statement [Line Items]
Concentration Risk, Percentage	43.00%	17.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Fred Meyer [Member]
Statement [Line Items]
Concentration Risk, Percentage	11.00%	11.00%
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Microwave Ovens [Member]
Statement [Line Items]
Concentration Risk, Percentage	27.00%	21.00%
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Audio Products [Member]
Statement [Line Items]
Concentration Risk, Percentage	73.00%	79.00%
Supplier Concentration Risk [Member] | Products for Resale [Member]
Statement [Line Items]
Number of Factory Suppliers	2	2
Supplier Concentration Risk [Member] | Products for Resale [Member] | Two Largest Factory Suppliers [Member]
Statement [Line Items]
Concentration Risk, Percentage	95.00%	100.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier One [Member]
Statement [Line Items]
Concentration Risk, Percentage	75.00%	83.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Two [Member]
Statement [Line Items]
Concentration Risk, Percentage	20.00%	17.00%
Sales Concentration Risk [Member] | Revenue Benchmark [Member]
Statement [Line Items]
Number of Sales Representative Organizations	2	4
Sales Concentration Risk [Member] | Revenue Benchmark [Member] | Sales Representative Organizations One [Member]
Statement [Line Items]
Concentration Risk, Percentage	38.00%	47.00%