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Consolidated Statements of Equity (USD $)
In Thousands, except Share data
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Noncontrolling Interest
Beginning Balance at May. 31, 2011 $ 189,102 $ 5,589 $ 79,386 $ (394) $ 104,182 $ 339
Beginning Balance (in shares) at May. 31, 2011   34,935,905        
Exercise of options and warrants, including share based compensation and income tax benefit (in shares)   472,520        
Exercise of options and warrants, including share based compensation and income tax benefit 7,887 76 7,811      
Issuance of shares under Employee Stock Purchase Plan (in shares) 21,216 21,216        
Issuance of shares under Employee Stock Purchase Plan 509 3 506      
Net income (loss) 22,389       22,513 (124)
Other comprehensive income (loss) (833)     (833)    
Ending Balance at May. 31, 2012 219,054 5,668 87,703 (1,227) 126,695 215
Ending Balance (in shares) at May. 31, 2012   35,429,641        
Exercise of options and warrants, including share based compensation and income tax benefit (in shares)   631,992        
Exercise of options and warrants, including share based compensation and income tax benefit 11,801 101 11,700      
Issuance of shares under Employee Stock Purchase Plan (in shares) 22,388 22,388        
Issuance of shares under Employee Stock Purchase Plan 536 4 532      
Net income (loss) 27,041       27,190 (149)
Other comprehensive income (loss) (145)     (145)    
Ending Balance at May. 31, 2013 258,287 5,773 99,935 (1,372) 153,885 66
Ending Balance (in shares) at May. 31, 2013 36,084,021 36,084,021        
Exercise of options and warrants, including share based compensation and income tax benefit (in shares)   629,826        
Exercise of options and warrants, including share based compensation and income tax benefit 17,623 101 17,522      
Issuance of shares under Employee Stock Purchase Plan (in shares) 18,466 18,466        
Issuance of shares under Employee Stock Purchase Plan 616 3 613      
Net income (loss) 28,031       28,158 (127)
Other comprehensive income (loss) 1,743     1,743    
Ending Balance at May. 31, 2014 $ 306,300 $ 5,877 $ 118,070 $ 371 $ 182,043 $ (61)
Ending Balance (in shares) at May. 31, 2014 36,732,313 36,732,313