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Consolidated Statements Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 3,088 $ (612) $ (5,094)
Other comprehensive (loss) income, before tax:      
Unrealized gain (loss) on marketable securities (16) 184 (103)
Unrealized gain (loss) on interest rate swap (32) (522) 327
Foreign currency translation gain (loss) 295 (47) (142)
Other comprehensive income (loss), before tax 247 (385) 82
Income tax benefit (expense) related to items of other comprehensive income 18 125 (83)
Other comprehensive income (loss), net of tax 265 (260) (1)
Total comprehensive income (loss), net of tax $ 3,353 $ (872) $ (5,095)