Note 4 - Intangible Assets (Tables)

6 Months Ended

Sep. 30, 2025

Notes Tables

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

	September 30, 2025											March 31, 2025
	Cost		Weighted Average Amortization Period (Years)				Accumulated Amortization			Net Carrying Amount		Cost		Weighted Average Amortization Period (Years)				Accumulated Amortization			Net Carrying Amount
Patents & Trademarks	$	35,794		10	-	15	$	(29,027	)	$	6,767	$	35,794		10	-	15	$	(27,982	)	$	7,812
Software	$	14,515		3			$	(9,680	)	$	4,835	$	14,515		3			$	(7,260	)	$	7,255
	$	50,309					$	(38,707	)	$	11,602	$	50,309					$	(35,242	)	$	15,067

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

For the fiscal years ended March 31,
2026	$	3,353
2027		4,139
2028		1,724
2029		1,551
2030		835
	$	11,602