Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common stock [Member]	Treasury stock [Member]	Capital in excess of stated value [Member]	Retained earnings [Member]	Accumulated other comprehensive loss [Member]
Beginning balance at Mar. 31, 2014	$ 132,873	$ 9,482	$ (2,741)	$ (13,409)	$ 139,675	$ (134)
Beginning balance (in shares) at Mar. 31, 2014		31,607	9,139
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash share based compensation expense	3,140			3,140
Restricted shares issued	0		$ 102	(102)
Restricted shares issued (in shares)			342
Shares issued upon exercise of stock options and SSARs	102		$ 5	97
Shares issued upon exercise of stock options and SSARs (in shares)			21
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(427)		$ (12)	(415)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	14
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(41)
Net loss	(11,497)				(11,497)
Unrealized foreign currency translation adjustments	(9)
Unrealized translation adjustment	(9)					(9)
Unrealized loss on securities	(8)					(8)
Ending balance at Mar. 31, 2015	124,188	$ 9,482	$ (2,646)	(10,675)	128,178	(151)
Ending balance (in shares) at Mar. 31, 2015		(31,607)	(8,817)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash share based compensation expense	3,405			3,405
Restricted shares issued	0		$ 54	(54)
Restricted shares issued (in shares)			181
Shares issued upon exercise of stock options and SSARs	0		$ 1	(1)
Shares issued upon exercise of stock options and SSARs (in shares)			2
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(329)		$ (9)	(320)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(30)
Net loss	(3,765)				(3,765)
Unrealized foreign currency translation adjustments	(26)
Unrealized translation adjustment	(26)					(26)
Ending balance at Mar. 31, 2016	123,473	$ 9,482	$ (2,600)	(7,645)	124,413	(177)
Ending balance (in shares) at Mar. 31, 2016		(31,607)	(8,664)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash share based compensation expense	2,427			2,427
Restricted shares issued	0		$ 83	(83)
Restricted shares issued (in shares)			277
Shares issued upon exercise of stock options and SSARs	0		$ 10	(10)
Shares issued upon exercise of stock options and SSARs (in shares)			33
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(483)		$ (12)	(471)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(43)
Net loss	(11,721)				(11,721)
Unrealized foreign currency translation adjustments	(27)					(27)
Ending balance at Mar. 31, 2017	$ 113,669	$ 9,482	$ (2,519)	$ (5,782)	$ 112,692	$ (204)
Ending balance (in shares) at Mar. 31, 2017		(31,607)	(8,397)