Note 8 - Concentration Risk (Details Textual)	3 Months Ended		12 Months Ended
Note 8 - Concentration Risk (Details Textual)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)
Accounts Receivable, Allowance for Credit Loss	$ 1,116,000	$ 29,000	$ 1,107,000	$ 25,000
Cash, Uninsured Amount	1,400,000		900,000
Short Term Deposits Held in Foreign Financial Institutions, Uninsured	$ 13,900,000		$ 14,900,000
Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Number of Customers	3	3
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Microwave Ovens [Member]
Concentration Risk, Percentage	87.00%	48.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Three Largest Customers [Member]
Concentration Risk, Percentage	65.00%	86.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Variety Wholesalers [Member]
Concentration Risk, Percentage	27.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Fred Meyer [Member]
Concentration Risk, Percentage	26.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Amazon [Member]
Concentration Risk, Percentage	12.00%	38.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Walmart [Member]
Concentration Risk, Percentage		36.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Grupo Chedraui [Member]
Concentration Risk, Percentage		12.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Audio Products [Member]
Concentration Risk, Percentage	10.00%	48.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Number of Customers	2		2
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Variety Wholesalers [Member]
Concentration Risk, Percentage	31.00%		19.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Fred Meyer [Member]
Concentration Risk, Percentage	31.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Amazon [Member]
Concentration Risk, Percentage			59.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer One [Member]
Concentration Risk, Percentage	31.00%		59.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer Two [Member]
Concentration Risk, Percentage	31.00%		19.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member]
Number of Customers	3	4
Concentration Risk, Percentage		100.00%
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] \| Supplier One [Member]
Concentration Risk, Percentage	40.00%	33.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Supplier Two [Member]
Concentration Risk, Percentage	40.00%	31.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Supplier Three [Member]
Concentration Risk, Percentage	20.00%	21.00%
Supplier Concentration Risk [Member] \| Products for Resale [Member] \| Supplier Four [Member]
Concentration Risk, Percentage		15.00%