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Note 9 - Stockholders' Equity - Consolidated Statements of Changes in Stockholders' Equity (Details)
$ in Thousands
 3 Months Ended
Aug. 30, 2015
USD ($)
shares
Common Stock Shares  
Balance at May 31, 2015 (in shares) | shares 26,990,490
Stock options exercised, net of shares tendered (in shares) | shares 24,532
Balance at August 30, 2015 (in shares) | shares 27,015,022
Balance at May 31, 2015 $ 27
Balance at August 30, 2015 27
Additional Paid-in Capital  
Balance at May 31, 2015 133,307
Stock options exercised, net of shares tendered 41
Stock-based compensation expense 797
Tax benefit from stock based compensation expense 74
Balance at August 30, 2015 134,219
Retained Earnings  
Balance at May 31, 2015 85,098
Net income applicable to Common Stockholders 2,952
Balance at August 30, 2015 88,050
Non-controlling Interest  
Balance at May 31, 2015 1,677
Non-controlling interest in net income 36
Balance at August 30, 2015 $ 1,713