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, 2012	$ 114,438	$ 9,482	$ (2,919)	$ (16,032)	$ 123,876	$ 31
Beginning balance (in shares) at Mar. 31, 2012		31,607	9,731
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash share based compensation expense	2,057			2,057
Restricted shares issued	0		$ 61	(61)
Restricted shares issued (in shares)			203
Shares issued upon exercise of stock options and SSARs	67		$ 32	35
Shares issued upon exercise of stock options and SSARs (in shares)			108
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(278)		$ (12)	(266)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(42)
Net income (loss)	(1,298)				(1,298)
Unrealized foreign currency translation adjustments	(1,126)
Reclassification of foreign currency translation adjustments included in net income (loss)	0
Unrealized translation adjustment	(1,126)					(1,126)
Unrealized loss on securities	(4)					(4)
Ending balance at Mar. 31, 2013	113,856	$ 9,482	$ (2,838)	(14,267)	122,578	(1,099)
Ending balance (in shares) at Mar. 31, 2013		(31,607)	(9,462)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash share based compensation expense	1,931			1,931
Restricted shares issued	0		$ 41	(41)
Restricted shares issued (in shares)			138
Shares issued upon exercise of stock options and SSARs	171		$ 244	(73)
Shares issued upon exercise of stock options and SSARs (in shares)			814
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(1,184)		$ (188)	(996)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(629)
Net income (loss)	17,097				17,097
Unrealized foreign currency translation adjustments	220
Reclassification of foreign currency translation adjustments included in net income (loss)	745
Unrealized translation adjustment	220					220
Unrealized loss on securities	745					745
Ending balance at Mar. 31, 2014	132,873	$ 9,482	$ (2,741)	(13,409)	139,675	(134)
Ending 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 income (loss)	(11,497)				(11,497)
Unrealized foreign currency translation adjustments	$ (9)					(9)
Reclassification of foreign currency translation adjustments included in net income (loss)						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]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	$ 8