Note 1 - Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Statement [Line Items]
Property, Plant and Equipment, Net	$ 1,250	$ 2,000
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	20,800	1,600
Contract with Customer, Refund Liability	83,000	84,000	$ 61,000
Sales Return Reserve, Period Increase (Decrease)	(1,000)	23,000
Advertising Expense	39,000	42,000
Unrecognized Tax Benefits, Income Tax Penalties Expense	$ 0	$ 0
Microwave Ovens [Member]
Statement [Line Items]
Product Warranty, Term (Year)	1 year
Audio Products [Member]
Statement [Line Items]
Product Warranty, Term (Year)	90 days
Computer Equipment [Member] | Minimum [Member]
Statement [Line Items]
Property, Plant and Equipment, Useful Life (Year)	3 years
Computer Equipment [Member] | Maximum [Member]
Statement [Line Items]
Property, Plant and Equipment, Useful Life (Year)	7 years
Furniture and Fixtures [Member]
Statement [Line Items]
Property, Plant and Equipment, Useful Life (Year)	7 years