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Note 9 - Stockholders' Equity - Consolidated Statements of Changes in Stockholders' Equity (Details)
 6 Months Ended
Nov. 29, 2015
USD ($)
shares
Employee Stock Option [Member]  
Common Stock Shares  
Stock options exercised, net of shares tendered (in shares) | shares 34,532
Stock options exercised, net of shares tendered $ 0
Additional Paid-in Capital  
Stock options exercised, net of shares tendered 108,000
Stock Swaps and RSUs [Member]  
Additional Paid-in Capital  
Taxes paid by Company for stock swaps and RSUs $ 0
Balance (in shares) | shares 26,990,490 [1]
Vested restricted stock units, net of shares tendered (in shares) | shares 8,114
Balance (in shares) | shares 27,033,136
Balance $ 27,000 [2]
Vested restricted stock units, net of shares tendered 0
Balance 27,000
Balance at May 31, 2015 133,307,000 [2]
Vested restricted stock units, net of shares tendered 0
Stock-based compensation expense 1,697,000
Tax benefit from stock based compensation expense 90,000
Balance at November 29, 2015 135,202,000
Retained Earnings  
Balance 85,098,000 [2]
Net income applicable to Common Stockholders 4,820,000
Balance 89,918,000
Non-controlling Interest  
Balance 1,677,000 [2]
Non-controlling interest in net income 96,000
Distributions to non-controlling interest (248,000)
Balance $ 1,525,000
[1] Derived from audited financial statements.
[2] Derived from audited financial statements.