STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock, Shares	Common Stock, Additional Paid-in Capital	Treasury Stock	Retained Earnings (Deficit)
Shareholders' equity, beginning of period at Mar. 31, 2019	$ 17,970		$ 155,828	$ (36,091)	$ (101,767)
Shareholders' equity, beginning of period (Shares) at Mar. 31, 2019		29,600,158
Exercise of stock options for cash	57		57
Exercise of stock options for cash (shares)		22,362
Shares issued under Employee Stock Purchase Plan	7			7
Shares issued under Employee Stock Purchase Plan (shares)		2,361
Stock-based compensation	618		618
Stock-based compensation (shares)		669,238
Employee tax withholdings on stock-based compensation	(79)			(79)
Employee tax withholdings on stock-based compensation (shares)		(28,122)
Net income	12,462				12,462
Shareholders' equity, end of period at Mar. 31, 2020	31,035		156,503	(36,163)	(89,305)
Shareholders' equity, at end of period (shares) at Mar. 31, 2020		30,265,997
Exercise of stock options for cash	229		229
Exercise of stock options for cash (shares)		99,000
Shares issued under Employee Stock Purchase Plan	$ 7			7
Shares issued under Employee Stock Purchase Plan (shares)	1,146	1,146
Stock-based compensation	$ 753		753
Stock-based compensation (shares)		450,481
Employee tax withholdings on stock-based compensation	(84)			(84)
Employee tax withholdings on stock-based compensation (shares)		(11,324)
Net income	26,134				26,134
Shareholders' equity, end of period at Mar. 31, 2021	58,074		157,485	(36,240)	(63,171)
Shareholders' equity, at end of period (shares) at Mar. 31, 2021		30,805,300
Exercise of stock options for cash	121		121
Exercise of stock options for cash (shares)		31,845
Shares issued under Employee Stock Purchase Plan	$ 6			6
Shares issued under Employee Stock Purchase Plan (shares)	1,617	1,617
Stock-based compensation	$ 813		813
Stock-based compensation (shares)		260,014
Employee tax withholdings on stock-based compensation	(5)			(5)
Employee tax withholdings on stock-based compensation (shares)		(904)
Net income	6,091				6,091
Shareholders' equity, end of period at Mar. 31, 2022	$ 65,100		$ 158,419	$ (36,239)	$ (57,080)
Shareholders' equity, at end of period (shares) at Mar. 31, 2022		31,097,872