Note 4 - Intangible Assets (Tables)

9 Months Ended

Dec. 31, 2024

Notes Tables

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

	December 31, 2024										March 31, 2024
	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	$	(27,071	)	$	8,723	$	35,794	10	-	15	$	(25,516	)	$	10,278
Software	$	14,515		3		$	(6,050	)	$	8,465	$	14,515		3		$	(2,420	)	$	12,095
	$	50,309				$	(33,121	)	$	17,188	$	50,309				$	(27,936	)	$	22,373

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

For the fiscal years ended March 31,
2025	$	1,779
2026		6,933
2027		4,225
2028		1,810
2029		1,613
thereafter		828
	$	17,188