CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Retained Earnings	Total
Beginning Balance - Amount at Mar. 31, 2012	$ 28	$ 54,402	$ 88	$ 74,261	$ 128,779
Beginning Balance - Shares at Mar. 31, 2012	27,617,942
Issuance of common stock under employee stock option plans, Shares	258,437
Issuance of common stock under employee stock option plans, Amount		857			857
Repurchase and retirement of common stock, shares	(811,170)
Repurchase and retirement of common stock, amount	(1)	(3,625)			(3,626)
Stock-based compensation expense		2,278			2,278
Windfall tax benefits recognized		92			92
Comprehensive income:
Net income				3,846	3,846
Net unrealized loss on available-for-sale investments			(43)		(43)
Comprehensive net income (loss)					3,803
Ending Balance, Amount at Mar. 31, 2013	27	54,004	45	78,107	132,183
Ending Balance, Shares at Mar. 31, 2013	27,065,209
Issuance of common stock under employee stock option plans, Shares	932,800
Issuance of common stock under employee stock option plans, Amount	1	3,080			3,081
Repurchase and retirement of common stock, shares	(436,527)
Repurchase and retirement of common stock, amount		(2,880)			(2,880)
Stock-based compensation expense		2,228			2,228
Windfall tax benefits recognized		(33)			(33)
Comprehensive income:
Net income				(6,189)	(6,189)
Net unrealized loss on available-for-sale investments			(12)		(12)
Comprehensive net income (loss)					(6,201)
Ending Balance, Amount at Mar. 31, 2014	28	56,399	33	71,918	128,378
Ending Balance, Shares at Mar. 31, 2014	27,561,482
Issuance of common stock under employee stock option plans, Shares	228,665
Issuance of common stock under employee stock option plans, Amount		952			952
Repurchase and retirement of common stock, shares	(4,661,775)
Repurchase and retirement of common stock, amount	(5)	(30,021)			(30,026)
Stock-based compensation expense		2,077			2,077
Comprehensive income:
Net income				(4,978)	(4,978)
Net unrealized loss on available-for-sale investments			(7)		(7)
Comprehensive net income (loss)					(4,985)
Ending Balance, Amount at Mar. 31, 2015	$ 23	$ 29,407	$ 26	$ 66,940	$ 96,396
Ending Balance, Shares at Mar. 31, 2015	23,128,372