UNAUDITED CONDENSED 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, 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	0	178	0	0	0	178
Issuance of shares for option exercises (in shares)	25,000					25,000	[1]
Excess tax benefit of share based compensation	0	756	0	0	0	756
Effect of share-based compensation	1	1,577	0	0	0	1,578
Effect of share-based compensation (in shares)	103,254
Purchase of treasury stock	0	0	(1,557)	0	0	(1,557)
Purchase of treasury stock (in shares)	(48,230)
Comprehensive income, net of tax: [Abstract]
Net earnings	0	0	0	18,095	0	18,095
Foreign currency translation adjustment (net of tax of $1)	0	0	0	0	41	41
Balance at Sep. 30, 2012	$ 128	$ 96,056	$ (66,973)	$ 209,001	$ 506	$ 238,718
Balance (in shares) at Sep. 30, 2012	8,079,919					8,079,919

[1] The total intrinsic value of stock options exercised during the six months ended September 30, 2012 was $683 thousand.