CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
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	3	3,676	0	0	0	3,679
Issuance of shares for option exercises (in shares)	272,300
Excess tax benefit of share based compensation	0	761			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)
Net earnings	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
Issuance of shares for option exercises	1	621	0	0	0	622
Issuance of shares for option exercises (in shares)	83,900
Excess tax benefit of share based compensation	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)
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
Issuance of shares for option exercises	1	1,166	0	0	0	1,167
Issuance of shares for option exercises (in shares)	105,000					105,000	[1]
Excess tax benefit of share based compensation	0	1,648	0	0	0	1,648
Effect of share-based compensation	1	3,282	0	0	0	3,283
Effect of share-based compensation (in shares)	102,162
Purchase of treasury stock	0	0	(1,890)	0	0	(1,890)
Purchase of treasury stock (in shares)	(57,351)
Dividends declared	0	0	0	(20,378)	0	(20,378)
Net earnings	0	0	0	34,830	0	34,830
Foreign currency translation adjustment	0	0	0	0	(55)	(55)
Total comprehensive income						34,775
Balance at Mar. 31, 2013	$ 129	$ 99,641	$ (67,306)	$ 205,358	$ 410	$ 238,232
Balance (in shares) at Mar. 31, 2013	8,149,706					8,149,706

[1] The total intrinsic value of stock options exercised during the year ended March 31, 2013 was $2.9 million.