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 [Member]	Total
Balance at Mar. 31, 2009	$ 115	$ 80,055	$ (37,229)	$ 131,067	[1]	$ 79	$ 174,087
Balance (in shares) at Mar. 31, 2009	8,088,513
Issuance of shares for option exercises and vesting of restricted shares	4	3,102	0	0		0	3,106
Issuance of shares for option exercises and vesting of restricted shares (in shares)	412,962
Tax benefit of exercised stock options	0	469	0	0		0	469
Effect of share-based compensation	0	474	0	0		0	474
Purchase of treasury stock	0	0	(6,117)	0		0	(6,117)
Purchase of treasury stock (in shares)	(377,967)
Comprehensive income, net of tax: [Abstract]
Net earnings	0	0	0	12,745		0	12,745
Foreign currency translation adjustment	0	0	0	0		342	342
Total comprehensive income							13,087
Balance at Mar. 31, 2010	119	84,100	(43,346)	143,812		421	185,106
Balance (in shares) at Mar. 31, 2010	8,123,508
Issuance of shares for option exercises and vesting of restricted shares	3	3,676	0	0		0	3,679
Issuance of shares for option exercises and vesting of restricted shares (in shares)	272,300
Tax benefit of exercised stock options	0	761	0	0		0	761
Effect of share-based compensation	3	1,255	0	0		0	1,258
Effect of share-based compensation (in shares)	267,390
Purchase of treasury stock	0	0	(2,652)	0		0	(2,652)
Purchase of treasury stock (in shares)	(144,009)
Comprehensive income, net of tax: [Abstract]
Net earnings	0	0	0	23,727		0	23,727
Foreign currency translation adjustment	0	0	0	0		98	98
Total comprehensive income							23,825
Balance at Mar. 31, 2011	125	89,792	(45,998)	167,539		519	211,977
Balance (in shares) at Mar. 31, 2011	8,519,189						8,519,189
Issuance of shares for option exercises and vesting of restricted shares	1	621	0	0		0	622
Issuance of shares for option exercises and vesting of restricted shares (in shares)	83,900
Tax benefit of exercised stock options	0	740	0	0		0	740
Effect of share-based compensation	1	2,392	0	0		0	2,393
Effect of share-based compensation (in shares)	151,505
Purchase of treasury stock	0	0	(19,418)	0		0	(19,418)
Purchase of treasury stock (in shares)	(754,699)
Comprehensive income, net of tax: [Abstract]
Net earnings	0	0	0	23,367		0	23,367
Foreign currency translation adjustment	0	0	0	0		(54)	(54)
Total comprehensive income							23,313
Balance at Mar. 31, 2012	$ 127	$ 93,545	$ (65,416)	$ 190,906		$ 465	$ 219,627
Balance (in shares) at Mar. 31, 2012	7,999,895						7,999,895

[1] Retained earning as of April 1, 2009 has been decreased by $385 thousand related to an adjustment for certain lease transactions.See Note 2 "Restatement of Consolidated Financial Statements" for further information.