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Note 5 - Concentrations (Details Textual)	3 Months Ended		6 Months Ended		12 Months Ended
Note 5 - Concentrations (Details Textual)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Mar. 31, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 754,132	$ 1,140,268	$ 1,516,821	$ 2,061,676
Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Number of Customers	2	3	2	2
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Two Customers [Member]
Concentration Risk, Percentage	48.00%		42.00%	50.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Three Customers [Member]
Concentration Risk, Percentage		65.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Foreign Customers [Member]
Concentration Risk, Percentage	10.00%	8.00%	13.00%	10.00%
Revenue from Contract with Customer, Including Assessed Tax	$ 79,106	$ 86,296	$ 198,141	$ 211,571
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk, Number of Customers			3		2
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Two Customers [Member]
Concentration Risk, Percentage					75.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Three Customers [Member]
Concentration Risk, Percentage			69.00%
Supplier Concentration Risk [Member] \| Accounts Payable [Member]
Concentration Risk, Number of Vendors			2
Supplier Concentration Risk [Member] \| Accounts Payable [Member] \| Three Vendors [Member]
Concentration Risk, Percentage			42.00%