Note 5 - Concentrations (Details Textual)	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 983,162	$ 749,654	$ 3,044,838	$ 2,322,871
Customer Concentration Risk [Member] | Two Customers [Member] | Revenue Benchmark [Member]
Concentration Risk, Number of Customers	2	2	2	2
Concentration Risk, Percentage		66.00%	45.00%	54.00%
Customer Concentration Risk [Member] | Two Customers [Member] | Accounts Receivable [Member]
Concentration Risk, Number of Customers			2
Concentration Risk, Percentage			54.00%
Customer Concentration Risk [Member] | Three Customers [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	50.00%
Customer Concentration Risk [Member] | Three Customers [Member] | Accounts Receivable [Member]
Concentration Risk, Number of Customers					3
Concentration Risk, Percentage					75.00%
Customer Concentration Risk [Member] | Foreign Customers [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	8.00%	11.00%	10.00%	10.00%
Revenue from Contract with Customer, Including Assessed Tax	$ 80,465	$ 80,358	$ 292,036	$ 237,852