Consolidated Statements of Shareholders' Equity and Comprehensive Income (Loss) (USD $) (USD $) In Thousands	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Retained Earnings / Accumulated Deficit	Total
Beginning balance, Amount at May. 31, 2009	$ 85	$ 44,552	$ 2,800	$ (37,474)	$ 9,963
Beginning balance, Shares at May. 31, 2009	8,496
Issuance of common stock under employee plan, Shares	168
Issuance of common stock under employee plan, Amount	2	174			176
Stock-based compensation		1,733			1,733
Net loss				(481)	(481)
Foreign currency translation adjustment			(110)		(110)
Comprehensive loss					(591)
Ending balance, Amount at May. 31, 2010	87	46,459	2,690	(37,955)	11,281
Ending balance, Shares at May. 31, 2010	8,664
Issuance of common stock under employee plan, Shares	268
Issuance of common stock under employee plan, Amount	2	341			343
Stock-based compensation		947			947
Net loss				(3,373)	(3,373)
Foreign currency translation adjustment			(97)		(97)
Comprehensive loss					(3,470)
Ending balance, Amount at May. 31, 2011	89	47,747	2,593	(41,328)	9,101
Ending balance, Shares at May. 31, 2011	8,932
Issuance of common stock under employee plan, Shares	203
Issuance of common stock under employee plan, Amount	2	166			168
Stock-based compensation		709			709
Net loss				(3,389)	(3,389)
Foreign currency translation adjustment			(135)		(135)
Comprehensive loss					(3,524)
Ending balance, Amount at May. 31, 2012	$ 91	$ 48,622	$ 2,458	$ (44,717)	$ 6,454
Ending balance, Shares at May. 31, 2012	9,135