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Note 16 - Stockholders' Equity (Tables)

12 Months Ended

Mar. 31, 2022

Notes Tables

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

		Fiscal years ended March 31,
		2022				2021
Stock options		$	3			$	19
Restricted stock and stock awards			4,615				3,428
Employee stock purchase plan			43				38
Total stock-based compensation expense		$	4,661			$	3,485

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

		Fiscal years ended March 31,
		2022				2021
Cost of revenues		$	209			$	40
Research and development			820				642
Selling, general and administrative			3,632				2,803
Total		$	4,661			$	3,485

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, 2021			127,165			$	44.37
Granted			—				—
Exercised			—				—
Canceled/forfeited			(28,880	)			99.33
Outstanding at March 31, 2022			98,285			$	28.23				1.5			$	8
Exercisable at March 31, 2022			98,285			$	28.23				1.5			$	8
Fully vested and expected to vest at March 31, 2022			98,285			$	28.23				1.5			$	8

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, 2021			1,047,914			$	7.17
Granted			569,348				14.47
Vested			(498,396	)			10.25
Forfeited			(7,200	)			11.50
Outstanding at March 31, 2022			1,111,666			$	9.65			$	8,460

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