Note 8 - Concentration Risk (Details Textual)	3 Months Ended			6 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($)	Jun. 30, 2025	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)
Accounts Receivable, Allowance for Credit Loss	$ 1,113,000		$ 37,000	$ 1,113,000	$ 37,000	$ 1,107,000	$ 29,000
Cash, Uninsured Amount	800,000			800,000		900,000
Short Term Deposits Held in Foreign Financial Institutions, Uninsured	$ 12,500,000			$ 12,500,000		$ 14,900,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Customers	3		3	3	3
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Microwave Ovens [Member]
Concentration Risk, Percentage	63.00%		43.00%	76.00%	45.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Audio Products [Member]
Concentration Risk, Percentage	27.00%		55.00%	18.00%	52.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Three Largest Customers [Member]
Concentration Risk, Percentage	77.00%		86.00%	62.00%	84.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Amazon [Member]
Concentration Risk, Percentage	56.00%		31.00%	31.00%	34.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Costco [Member]
Concentration Risk, Percentage	11.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Variety Wholesalers [Member]
Concentration Risk, Percentage	10.00%			16.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Fred Meyer [Member]
Concentration Risk, Percentage			13.00%	15.00%	11.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Walmart [Member]
Concentration Risk, Percentage			42.00%		39.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Customers				2		2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Amazon [Member]
Concentration Risk, Percentage				59.00%		59.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Variety Wholesalers [Member]
Concentration Risk, Percentage						19.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Fred Meyer [Member]
Concentration Risk, Percentage				15.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member]
Concentration Risk, Percentage				59.00%		59.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member]
Concentration Risk, Percentage				15.00%		19.00%
Supplier Concentration Risk [Member] | Products for Resale [Member]
Number of Customers	3		4	3	5
Supplier Concentration Risk [Member] | Products for Resale [Member] | Three Largest Factory Suppliers [Member]
Concentration Risk, Percentage		100.00%		93.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier One [Member]
Concentration Risk, Percentage	46.00%		47.00%	41.00%	38.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Two [Member]
Concentration Risk, Percentage	27.00%		16.00%	30.00%	19.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Three [Member]
Concentration Risk, Percentage	27.00%		16.00%	22.00%	17.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Four Largest Factory Suppliers [Member]
Concentration Risk, Percentage			91.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Four [Member]
Concentration Risk, Percentage			12.00%		16.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Five Largest Factory Suppliers [Member]
Concentration Risk, Percentage					100.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Five [Member]
Concentration Risk, Percentage					10.00%