Consolidated Statements of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	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, 2011	$ 148,104	$ 9,482	$ (2,575)	$ (5,421)	$ 146,659	$ (41)
Beginning balance (in shares) at Mar. 31, 2011		31,607	8,584
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of treasury shares	13,173		481	12,692
Purchase of treasury shares (in shares)			(1,600)
Non-cash share based compensation expense	2,368			2,368
Restricted shares issued	1,089		39	1,050
Restricted shares issued (in shares)			130
Shares issued upon exercise of stock options and SSARs	210		179	31
Shares issued upon exercise of stock options and SSARs (in shares)			595
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares	(1,449)		(81)	(1,368)
Shares withheld for taxes upon exercise of stock options, SSARs or vesting of restricted shares (in shares)			(272)
Net income (loss)	(22,783)				(22,783)
Unrealized foreign currency translation adjustments	76
Reclassification of foreign currency translation adjustments included in net income (loss)	0
Unrealized translation adjustment	76					76
Unrealized loss on securities	(4)					(4)
Ending balance at Mar. 31, 2012	114,438	9,482	(2,919)	(16,032)	123,876	31
Ending 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)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	37
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					220
Reclassification of foreign currency translation adjustments included in net income (loss)	(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)