CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Mar. 31, 2011	$ 125	$ 89,792	$ (45,998)	$ 167,924	$ 519	$ 212,362
Balance (in shares) at Mar. 31, 2011	8,519,189
Issuance of shares for option exercises	1	585	0	0	0	586
Issuance of shares for option exercises (in shares)	78,900
Excess tax benefit of exercised stock options	0	965	0	0	0	965
Effect of share-based compensation, net of forfeitures	1	1,735	0	0	0	1,736
Effect of share-based compensation, net of forfeitures (in shares)	150,703
Purchase of treasury stock	0	0	(18,579)	0	0	(18,579)
Purchase of treasury stock (in shares)	(724,237)
Share-based compensation expense						1,736
Comprehensive income, net of tax: [Abstract]
Net earnings	0	0	0	19,510	0	19,510
Foreign currency translation adjustment (net of tax of $1)	0	0	0	0	(117)	(117)
Total comprehensive income						19,393
Balance at Dec. 31, 2011	$ 127	$ 93,077	$ (64,577)	$ 187,434	$ 402	$ 216,463
Balance (in shares) at Dec. 31, 2011	8,024,555