Note 8 - Concentration Risk (Details Textual)	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2024 USD ($)
Cash, Uninsured Amount	$ 200,000		$ 200,000		$ 19,600,000
Maximum [Member]
Cash, FDIC Insured Amount		$ 250,000		$ 250,000
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	43.00%	27.00%	45.00%	32.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Audio Products [Member]
Concentration Risk, Percentage		70.00%	52.00%	66.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Three Largest Customers [Member]
Concentration Risk, Percentage	86.00%	90.00%	84.00%	89.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Walmart [Member]
Concentration Risk, Percentage	42.00%	60.00%	39.00%	53.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Amazon [Member]
Concentration Risk, Percentage	31.00%	19.00%	34.00%	22.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Fred Meyer [Member]
Concentration Risk, Percentage	13.00%	11.00%	11.00%	14.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Audio Products [Member]
Concentration Risk, Percentage	55.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Customers			4		3
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer One [Member]
Concentration Risk, Percentage			42.00%		34.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Two [Member]
Concentration Risk, Percentage			23.00%		30.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Three [Member]
Concentration Risk, Percentage			16.00%		25.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer Four [Member]
Concentration Risk, Percentage			14.00%
Supplier Concentration Risk [Member] | Products for Resale [Member]
Number of Customers		3	5
Number of Factory Suppliers	4			3
Supplier Concentration Risk [Member] | Products for Resale [Member] | Largest Supplier [Member]
Concentration Risk, Percentage		34.00%	38.00%	39.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier One [Member]
Concentration Risk, Percentage		31.00%	19.00%	24.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Three [Member]
Concentration Risk, Percentage		15.00%	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 Two [Member]
Concentration Risk, Percentage			17.00%	17.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Four [Member]
Concentration Risk, Percentage			10.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Three Largest Factory Suppliers [Member]
Concentration Risk, Percentage				80.00%
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] | Largest Supplier [Member]
Concentration Risk, Percentage	47.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier One [Member]
Concentration Risk, Percentage	16.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Two [Member]
Concentration Risk, Percentage	16.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Supplier Three [Member]
Concentration Risk, Percentage	12.00%
Supplier Concentration Risk [Member] | Products for Resale [Member] | Three Largest Factory Suppliers [Member]
Concentration Risk, Percentage		80.00%