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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock
Additional paid in capital
Retained earnings
Accumulated other comprehensive loss
Treasury Stock
Beginning Balance at May. 31, 2011 $ 405,639 $ 250 $ 371,393 $ 35,269 $ (1,273) $ 0
Beginning Balance, Shares at May. 31, 2011   24,985,657       0
Net income (5,094)     (5,094)    
Exercise of stock options 2,157 2 2,155      
Exercise of stock options, Shares 193,684 193,684        
Tax effect of exercise of stock options (295)   (295)      
Issuance of performance shares, net 0          
Issuance of performance shares, net, Shares   64,221        
Purchase of common stock under Employee Stock Purchase Plan 1,202 1 1,201      
Purchase of common stock under Employee Stock Purchase Plan, Shares   103,362        
Shares issued pursuant to acquisition 117,926 95 117,831      
Shares issued pursuant to acquisition, shares   9,479,607        
Purchase of common stock for treasury (2,104)         (2,104)
Purchase of common stock for treasury, shares (142,305)         (142,305)
Stock-based compensation 4,090   4,090      
Other comprehensive loss, net of tax (1)       (1)  
Ending Balance at May. 31, 2012 523,520 348 496,375 30,175 (1,274) (2,104)
Ending Balance, Shares at May. 31, 2012   34,826,531       (142,305)
Net income (612)     (612)    
Exercise of stock options 5   5      
Exercise of stock options, Shares 16,835 16,835        
Tax effect of exercise of stock options (1,644)   (1,644)      
Issuance of performance shares, net 1 1        
Issuance of performance shares, net, Shares   93,429        
Purchase of common stock under Employee Stock Purchase Plan 1,211 2 1,209      
Purchase of common stock under Employee Stock Purchase Plan, Shares   123,556        
Purchase of common stock for treasury, shares 0          
Stock-based compensation 4,609   4,609      
Other comprehensive loss, net of tax (260)       (260)  
Ending Balance at May. 31, 2013 526,830 351 500,554 29,563 (1,534) (2,104)
Ending Balance, Shares at May. 31, 2013   35,060,351       (142,305)
Net income 3,088     3,088    
Exercise of stock options 1,085   1,085      
Exercise of stock options, Shares 105,676 105,676        
Tax effect of exercise of stock options (146)   (146)      
Issuance of performance shares, net 1 1        
Issuance of performance shares, net, Shares   129,702        
Purchase of common stock under Employee Stock Purchase Plan 1,360 1 1,359      
Purchase of common stock under Employee Stock Purchase Plan, Shares   146,275        
Purchase of common stock for treasury, shares 0          
Stock-based compensation 5,411   5,411      
Other comprehensive loss, net of tax 265       265  
Ending Balance at May. 31, 2014 $ 537,894 $ 353 $ 508,263 $ 32,651 $ (1,269) $ (2,104)
Ending Balance, Shares at May. 31, 2014   35,442,004       (142,305)