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Note 9 - Concentrations (Details Textual)	12 Months Ended
Note 9 - Concentrations (Details Textual)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Revenue from Contract with Customer, Including Assessed Tax	$ 3,018,954	$ 3,754,212
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Two Customers [Member]
Concentration Risk, Number of Customers	2
Concentration Risk, Percentage	58.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Three Customers [Member]
Concentration Risk, Number of Customers		3
Concentration Risk, Percentage		58.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Foreign Customers [Member]
Concentration Risk, Percentage	12.00%	8.80%
Revenue from Contract with Customer, Including Assessed Tax	$ 364,418	$ 341,415
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Two Customers [Member]
Concentration Risk, Number of Customers		2
Concentration Risk, Percentage		75.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Three Customers [Member]
Concentration Risk, Number of Customers	3
Concentration Risk, Percentage	91.00%