Note 5 - Concentrations (Details Textual)	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Mar. 31, 2025
Revenue from Contract with Customer, Including Assessed Tax	$ 887,498	$ 840,036	$ 1,861,173	$ 1,697,881
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member]
Concentration Risk, Number of Customers	2	2	2	2
Concentration Risk, Percentage	46.00%	50.00%	47.00%	45.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Foreign Customers [Member]
Concentration Risk, Percentage	15.00%	11.00%	14.00%	13.00%
Revenue from Contract with Customer, Including Assessed Tax	$ 131,256	$ 95,900	$ 267,671	$ 214,181
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Two Customers [Member]
Concentration Risk, Number of Customers			2
Concentration Risk, Percentage			50.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Four Customers [Member]
Concentration Risk, Number of Customers					4
Concentration Risk, Percentage					89.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Three Customers [Member]
Concentration Risk, Number of Customers				3
Concentration Risk, Percentage				81.00%
Accounts Payable Balance [Member] | Vendor Concentration Risk [Member] | One Vendor [Member]
Concentration Risk, Percentage			27.00%	17.00%
Number of Vendors			1	1