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Note 17 - Stockholders' Equity (Tables)

12 Months Ended

Mar. 31, 2023

Notes Tables

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

		Fiscal years ended March 31,
		2023				2022
Stock options		$	32			$	3
Restricted stock and stock awards			4,656				4,615
Employee stock purchase plan			41				43
Total stock-based compensation expense		$	4,729			$	4,661

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

		Fiscal years ended March 31,
		2023				2022
Cost of revenues		$	283			$	209
Research and development			865				820
Selling, general and administrative			3,581				3,632
Total		$	4,729			$	4,661

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, 2022			98,013			$	28.22
Granted			20,564				5.92
Exercised			—				—
Canceled/forfeited			(37,572	)			40.42
Outstanding at March 31, 2023			81,005			$	16.90				3.4				-
Exercisable at March 31, 2023			60,441			$	20.63				1.4				-
Fully vested and expected to vest at March 31, 2023			80,274			$	17.00				3.3				-

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

		Fiscal year ended March 31,				Fiscal year ended March 31,
		2023				2022
Expected volatility			71.4	%			N/A
Risk-free interest rate			3.1	%			N/A
Expected life (years)			6.14				N/A
Dividend yield		None					N/A

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, 2022			1,102,166			$	9.62
Granted			914,306				4.84
Vested			(460,973	)			9.02
Forfeited			(77,500	)			10.39
Outstanding at March 31, 2023			1,477,999			$	6.81			$	7,257

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