Note 4 - Intangible Assets (Tables)

12 Months Ended

Mar. 31, 2025

Notes Tables

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

		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			$	(27,982	)		$	7,812			$	35,794				10	-	15			$	(25,516	)		$	10,278
Software		$	14,515				3					$	(7,260	)		$	7,255			$	14,515				3					$	(2,420	)		$	12,095

		$	50,309									$	(35,242	)		$	15,067			$	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,
2026		$	6,817
2027			4,140
2028			1,724
2029			1,551
2030			835

		$	15,067