Note 5 - Intangible Assets (Tables)

3 Months Ended

Jun. 30, 2020

Notes Tables

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	June 30, 2020											March 31, 2020
	Cost		Accumulated Amortization			Net Carrying Amount		Amortization Period (Years)				Cost		Accumulated Amortization			Net Carrying Amount		Amortization Period (Years)
Patents & Trademarks	$	35,794	$	(14,710	)	$	21,084		10	-	15	$	35,794	$	(14,091	)	$	21,703	10	-	15

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

For the fiscal years ended June 30,
2021	$	2,882
2022		2,882
2023		2,882
2024		2,882
2025		2,275
Thereafter		7,281
	$	21,084