Unaudited Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Mar. 31, 2019	21,652
Balance at Mar. 31, 2019	$ 216	$ 1,044,622	$ (2,101)	$ (5)	$ (961,539)	$ 81,193
Issuance of common stock - restricted shares (in shares)	174
Issuance of common stock - restricted shares	$ 2	(2)
Stock-based compensation expense		249				249
Issuance of stock for 401(k) match (in shares)	8
Issuance of stock for 401(k) match		81				81
Repurchase of treasury stock			(283)			(283)
Cumulative translation adjustment				418		418
Net loss					(3,539)	(3,539)
Issuance of common stock - warrant exercise (in shares)	23
Issuance of common stock - warrant exercise		294				294
Balance (in shares) at Jun. 30, 2019	21,857
Balance at Jun. 30, 2019	$ 218	1,045,244	(2,384)	413	(965,078)	78,413
Balance (in shares) at Mar. 31, 2019	21,652
Balance at Mar. 31, 2019	$ 216	1,044,622	(2,101)	(5)	(961,539)	81,193
Cumulative translation adjustment						(851)
Net loss						(4,364)
Balance (in shares) at Sep. 30, 2019	21,894
Balance at Sep. 30, 2019	$ 218	1,045,833	(2,606)	(856)	(965,903)	76,686
Balance (in shares) at Jun. 30, 2019	21,857
Balance at Jun. 30, 2019	$ 218	1,045,244	(2,384)	413	(965,078)	78,413
Issuance of common stock - restricted shares (in shares)	10
Issuance of common stock - restricted shares
Stock-based compensation expense		397				397
Issuance of stock for 401(k) match (in shares)	12
Issuance of stock for 401(k) match		92				92
Repurchase of treasury stock			(222)			(222)
Cumulative translation adjustment				(1,269)		(1,269)
Net loss					(825)	(825)
Issuance of common stock - ESPP (in shares)	15
Issuance of common stock - ESPP		100				100
Balance (in shares) at Sep. 30, 2019	21,894
Balance at Sep. 30, 2019	$ 218	1,045,833	(2,606)	(856)	(965,903)	76,686
Balance (in shares) at Mar. 31, 2020	22,902
Balance at Mar. 31, 2020	$ 229	1,053,507	(2,666)	(216)	(978,635)	72,219
Issuance of common stock - restricted shares (in shares)	493
Issuance of common stock - restricted shares	$ 5	(5)
Stock-based compensation expense		909				909
Issuance of stock for 401(k) match (in shares)	13
Issuance of stock for 401(k) match		88				88
Repurchase of treasury stock			(377)			(377)
Cumulative translation adjustment				(3)		(3)
Net loss					(3,417)	(3,417)
Balance (in shares) at Jun. 30, 2020	23,408
Balance at Jun. 30, 2020	$ 234	1,054,499	(3,043)	(219)	(982,052)	69,419
Balance (in shares) at Mar. 31, 2020	22,902
Balance at Mar. 31, 2020	$ 229	1,053,507	(2,666)	(216)	(978,635)	72,219
Cumulative translation adjustment						(46)
Net loss						(7,129)
Balance (in shares) at Sep. 30, 2020	23,458
Balance at Sep. 30, 2020	$ 234	1,055,548	(3,336)	(262)	(985,764)	66,420
Balance (in shares) at Jun. 30, 2020	23,408
Balance at Jun. 30, 2020	$ 234	1,054,499	(3,043)	(219)	(982,052)	69,419
Issuance of common stock - restricted shares (in shares)	33
Issuance of common stock - restricted shares
Stock-based compensation expense		849				849
Issuance of stock for 401(k) match (in shares)	9
Issuance of stock for 401(k) match		101				101
Repurchase of treasury stock			(293)			(293)
Cumulative translation adjustment				(43)		(43)
Net loss					(3,712)	(3,712)
Issuance of common stock - ESPP (in shares)	8
Issuance of common stock - ESPP		99				99
Balance (in shares) at Sep. 30, 2020	23,458
Balance at Sep. 30, 2020	$ 234	$ 1,055,548	$ (3,336)	$ (262)	$ (985,764)	$ 66,420