Consolidated Statements of Stockholders' Equity and Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	Total USD ($)	Common Stock [Member] USD ($)	Capital In Excess of Par Value [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Retained Earnings [Member] USD ($)	Deferred Stock Units (DSUs), Director [Member] USD ($)	Deferred Stock Units (DSUs), Director [Member] Common Stock [Member]	Deferred Stock Units (DSUs), Director [Member] Capital In Excess of Par Value [Member] USD ($)	Stock Options [Member] USD ($)	Stock Options [Member] Common Stock [Member]	Stock Options [Member] Capital In Excess of Par Value [Member] USD ($)	Restricted Stock Units (RSUs) [Member] USD ($)	Restricted Stock Units (RSUs) [Member] Common Stock [Member]	Restricted Stock Units (RSUs) [Member] Capital In Excess of Par Value [Member] USD ($)
Balance at Mar. 31, 2009	$ 46,977	$ 11	$ 45,504	$ (203)	$ 1,665
Balance Shares, Outstanding at Mar. 31, 2009		10,420,937
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	576				576
Unrealized gain (loss) on foreign currency translation	208			208
Unrealized gain (loss) on investments, net of tax	84			84
Comprehensive income (loss)	868
Common stock issued pursuant to stock plans, shares		141,950					66,000
Common stock issued pursuant to stock plans	1,118		1,118
Common stock used to pay for option exercises and taxes	(75)		(75)
Common stock used to pay for option exercises and taxes, shares		(3,590)
Stock-based compensation expense						675		675	559		559	947		947
Common stock repurchased, shares		(29,850)
Common stock repurchased	(302)		(302)
Income tax effect from stock-based compensation	461		461
Balance at Mar. 31, 2010	51,228	11	48,887	89	2,241
Balance Shares, Outstanding at Mar. 31, 2010		10,595,447
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(767)				(767)
Unrealized gain (loss) on foreign currency translation	474			474
Unrealized gain (loss) on investments, net of tax	(33)			(33)
Comprehensive income (loss)	(326)
Common stock issued pursuant to stock plans, shares		801,787					66,750
Common stock issued pursuant to stock plans	3,009		3,009
Common stock used to pay for option exercises	(1,173)		(1,173)
Common stock used to pay for option exercises, shares		(47,973)
Common stock used to pay for taxes associated with option exercises and vested RSUs, shares										(89,222)			(84,173)
Common stock used to pay for taxes associated with option exercises and vested RSUs									(2,224)		(2,224)	(2,152)		(2,152)
Stock-based compensation expense						1,201		1,201	1,160		1,160	2,397		2,397
Contingent equity consideration related to acquisition	2,000		2,000
Common stock repurchased
Income tax effect from stock-based compensation	1,253		1,253
Balance at Mar. 31, 2011	56,373	11	54,358	530	1,474
Balance Shares, Outstanding at Mar. 31, 2011		11,242,616
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(6,426)				(6,426)
Unrealized gain (loss) on foreign currency translation	(284)			(284)
Unrealized gain (loss) on investments, net of tax	95			95
Comprehensive income (loss)	(6,615)
Common stock issued pursuant to stock plans, shares		158,808
Common stock issued pursuant to stock plans	1,008		1,008
Common stock used to pay for option exercises	(746)		(746)
Common stock used to pay for option exercises, shares		(40,344)
Common stock used to pay for taxes associated with option exercises and vested RSUs, shares										(11,704)
Common stock used to pay for taxes associated with option exercises and vested RSUs									(210)		(210)
Common stock issued in satisfaction of contingent payouts related to acquisition		33,417
Stock-based compensation expense						792		792	3,451		3,451	711		711
Common stock repurchased, shares		(304,922)
Common stock repurchased	(4,341)		(4,341)
Income tax effect from stock-based compensation	102		102
Balance at Mar. 31, 2012	$ 50,525	$ 11	$ 55,125	$ 341	$ (4,952)
Balance Shares, Outstanding at Mar. 31, 2012		11,077,871