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Note 16 - Stockholders' Equity (Tables)

12 Months Ended

Mar. 31, 2024

Notes Tables

Share-Based Payment Arrangement, Cost by Plan [Table Text Block]

		Fiscal years ended March 31,
		2024				2023
Stock options		$	40			$	32
Restricted stock and stock awards			4,563				4,656
Employee stock purchase plan			49				41
Total stock-based compensation expense		$	4,652			$	4,729

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

		Fiscal years ended March 31,
		2024				2023
Cost of revenues		$	293			$	283
Research and development			627				865
Selling, general and administrative			3,732				3,581
Total		$	4,652			$	4,729

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

		Options / Shares				Weighted-Average Exercise Price				Weighted-Average Remaining Contractual Term				Aggregate Intrinsic Value (thousands)
Outstanding at March 31, 2023			81,205			$	16.92
Granted			—				—
Exercised			—				—
Canceled/forfeited			(44,999	)			24.95
Outstanding at March 31, 2024			36,206			$	6.94				6.2			$	238
Exercisable at March 31, 2024			25,924			$	7.34				5.4			$	160
Fully vested and expected to vest at March 31, 2024			36,107			$	6.94				6.2			$	237

Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]

Expected volatility			71.4	%
Risk-free interest rate			3.1	%
Expected life (years)			6.1
Dividend yield			None

Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

		Shares				Weighted Average Grant Date Fair Value				Intrinsic Aggregate Value (thousands)
Outstanding at March 31, 2023			1,477,999			$	6.89
Granted			735,175				6.57
Vested			(735,267	)			6.83
Forfeited			(52,253	)			7.31
Outstanding at March 31, 2024			1,425,654			$	6.74			$	19,261

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