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Consolidated Statements of Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Noncontrolling Interest
Beginning Balance at May. 31, 2010 $ 153,221 $ 3,621 $ 69,550 $ (1,676) $ 81,343 $ 383
Beginning Balance (in shares) at May. 31, 2010   22,625,399        
Exercise of options and warrants, including share based compensation and income tax benefit (in shares)   646,953        
Exercise of options and warrants, including share based compensation and income tax benefit 11,386 103 11,283      
Issuance of shares under Employee Stock Purchase Plan (in shares) 18,252 18,252        
Issuance of shares under Employee Stock Purchase Plan 418 3 415      
Comprehensive income:            
Net income 22,795       22,839 (44)
Other comprehensive loss 1,282     1,282    
Ending Balance at May. 31, 2011 189,102 3,727 81,248 (394) 104,182 339
Ending Balance (in shares) at May. 31, 2011   23,290,604        
Exercise of options and warrants, including share based compensation and income tax benefit (in shares)   315,013        
Exercise of options and warrants, including share based compensation and income tax benefit 7,887 50 7,837      
Issuance of shares under Employee Stock Purchase Plan (in shares) 14,144 14,144        
Issuance of shares under Employee Stock Purchase Plan 509 2 507      
Comprehensive income:            
Net income 22,389       22,513 (124)
Other comprehensive loss (833)     (833)    
Ending Balance at May. 31, 2012 219,054 3,779 89,592 (1,227) 126,695 215
Ending Balance (in shares) at May. 31, 2012 23,619,761 23,619,761        
Exercise of options and warrants, including share based compensation and income tax benefit (in shares)   421,328        
Exercise of options and warrants, including share based compensation and income tax benefit 11,801 68 11,733      
Issuance of shares under Employee Stock Purchase Plan (in shares) 14,925 14,925        
Issuance of shares under Employee Stock Purchase Plan 536 2 534      
Comprehensive income:            
Net income 27,041       27,190 (149)
Other comprehensive loss (145)     (145)    
Ending Balance at May. 31, 2013 $ 258,287 $ 3,849 $ 101,859 $ (1,372) $ 153,885 $ 66
Ending Balance (in shares) at May. 31, 2013 24,056,014 24,056,014