UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock, Shares	Common Stock, Additional Paid-in Capital	Treasury Stock	Retained 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	16		16
Exercise of stock options for cash (shares)		10,000
Shares issued under Employee Stock Purchase Plan	2			2
Shares issued under Employee Stock Purchase Plan (shares)		613
Stock-based compensation	171		171
Stock-based compensation (shares)		535,344
Employee tax withholdings on stock-based compensation	(64)			(64)
Employee tax withholdings on stock-based compensation (shares)		(24,628)
Net income (loss)	3,968				3,968
Shareholders' equity, end of period at Jun. 30, 2019	22,063		156,015	(36,153)	(97,799)
Shareholders' equity, at end of period (shares) at Jun. 30, 2019		30,121,487
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
Net income (loss)	10,689
Shareholders' equity, end of period at Sep. 30, 2019	28,932		156,174	(36,164)	(91,078)
Shareholders' equity, at end of period (shares) at Sep. 30, 2019		30,231,077
Shareholders' equity, beginning of period at Jun. 30, 2019	22,063		156,015	(36,153)	(97,799)
Shareholders' equity, beginning of period (Shares) at Jun. 30, 2019		30,121,487
Shares issued under Employee Stock Purchase Plan	2			2
Shares issued under Employee Stock Purchase Plan (shares)		570
Stock-based compensation	159		159
Stock-based compensation (shares)		111,848
Employee tax withholdings on stock-based compensation	(13)			(13)
Employee tax withholdings on stock-based compensation (shares)		(2,828)
Net income (loss)	6,721				6,721
Shareholders' equity, end of period at Sep. 30, 2019	28,932		156,174	(36,164)	(91,078)
Shareholders' equity, at end of period (shares) at Sep. 30, 2019		30,231,077
Shareholders' equity, beginning of period at Mar. 31, 2020	31,035		156,503	(36,163)	(89,305)
Shareholders' equity, beginning of period (Shares) at Mar. 31, 2020		30,265,997
Exercise of stock options for cash	41		41
Exercise of stock options for cash (shares)		20,000
Shares issued under Employee Stock Purchase Plan	$ 2			2
Shares issued under Employee Stock Purchase Plan (shares)	458	458
Stock-based compensation	$ 208		208
Stock-based compensation (shares)		342,780
Employee tax withholdings on stock-based compensation	(18)			(18)
Employee tax withholdings on stock-based compensation (shares)		(4,346)
Net income (loss)	(2,219)				(2,219)
Shareholders' equity, end of period at Jun. 30, 2020	29,049		156,752	(36,179)	(91,524)
Shareholders' equity, at end of period (shares) at Jun. 30, 2020		30,624,889
Shareholders' equity, beginning of period at Mar. 31, 2020	$ 31,035		156,503	(36,163)	(89,305)
Shareholders' equity, beginning of period (Shares) at Mar. 31, 2020		30,265,997
Shares issued under Employee Stock Purchase Plan (shares)	609
Net income (loss)	$ (305)
Shareholders' equity, end of period at Sep. 30, 2020	31,240		157,031	(36,181)	(89,610)
Shareholders' equity, at end of period (shares) at Sep. 30, 2020		30,709,810
Shareholders' equity, beginning of period at Jun. 30, 2020	29,049		156,752	(36,179)	(91,524)
Shareholders' equity, beginning of period (Shares) at Jun. 30, 2020		30,624,889
Exercise of stock options for cash	28		28
Exercise of stock options for cash (shares)		9,000
Shares issued under Employee Stock Purchase Plan	$ 1			1
Shares issued under Employee Stock Purchase Plan (shares)	151	151
Stock-based compensation	$ 251		251
Stock-based compensation (shares)		76,351
Employee tax withholdings on stock-based compensation	(3)			(3)
Employee tax withholdings on stock-based compensation (shares)		(581)
Net income (loss)	1,914				1,914
Shareholders' equity, end of period at Sep. 30, 2020	$ 31,240		$ 157,031	$ (36,181)	$ (89,610)
Shareholders' equity, at end of period (shares) at Sep. 30, 2020		30,709,810