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Note 15 - Stockholders' Equity (Tables)

12 Months Ended

Mar. 31, 2021

Notes Tables

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

		Fiscal years ended March 31,
		2021				2020
Stock options		$	19			$	16
Restricted stock and stock awards			3,428				1,870
Employee stock purchase plan			38				36
Total stock-based compensation expense		$	3,485			$	1,922

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

		Fiscal years ended March 31,
		2021				2020
Cost of revenues		$	40			$	66
Research and development			642				333
Selling, general and administrative			2,803				1,522
Total		$	3,485			$	1,922

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, 2020			140,281			$	49.95
Granted			—				—
Exercised			(2,588	)			24.30
Canceled/forfeited			(10,528	)			129.53
Outstanding at March 31, 2021			127,165			$	44.37				2.0			$	167
Exercisable at March 31, 2021			127,140			$	44.38				2.0			$	167
Fully vested and expected to vest at March 31, 2021			124,196			$	45.18				1.9			$	143

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		Fiscal years ended March 31,
		2020
Expected volatility			66.5	%
Risk-free interest rate			1.8	%
Expected life (years)			5.91
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, 2020			982,247			$	6.26
Granted			712,824				6.97
Vested			(414,449	)			5.84
Forfeited			(232,708	)			4.30
Outstanding at March 31, 2021			1,047,914			$	7.17			$	19,868

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