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Earnings Per Share (Detail) (USD $)
3 Months Ended
Aug. 30, 2014
Aug. 31, 2013
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Income from continuing operations $ (83,000) $ 1,979,000
Loss from discontinued operations, net of tax 0 (11,000)
Net income (loss) (83,000) 1,968,000
Earnings Per Share, Basic and Diluted [Abstract]    
Antidilutive securities excluded from computation of earnings per share (in shares) 674,564 462,464
Common Stock
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Net income (loss)     
Denominator for Basic and Diluted Earnings Per Share [Abstract]    
Weighted average shares, basic (in shares) 11,822,000 12,127,000
Weighted average shares, diluted (in shares) 11,822,000 14,688,000
Weighted average shares and shares under if-coverted method for diluted EPS, basic (in shares) $ (0.01) $ 0.14
Weighted average shares and shares under if-coverted method for diluted EPS, diluted (in shares) $ (0.01) $ 0.14
Earnings Per Share, Basic and Diluted [Abstract]    
Net income per share, basic (in dollars per share) $ (0.01) $ 0.14
Net income per share, diluted (in dollars per share) $ (0.01) $ 0.14
Class B Common Stock
   
Denominator for Basic and Diluted Earnings Per Share [Abstract]    
Weighted average shares, basic (in shares) 2,182,000 2,428,000
Weighted average shares, diluted (in shares) 2,182,000 2,428,000
Weighted average shares and shares under if-coverted method for diluted EPS, basic (in shares) $ (0.01) $ 0.13
Weighted average shares and shares under if-coverted method for diluted EPS, diluted (in shares) $ (0.01) $ 0.13
Earnings Per Share, Basic and Diluted [Abstract]    
Net income per share, basic (in dollars per share) $ (0.01) $ 0.13
Net income per share, diluted (in dollars per share) $ (0.01) $ 0.13
Basic
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Undistributed basic earnings (losses) (911) 1,111
Net income (loss) (83) 1,968
Basic | Common Stock
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Dividends 710 723
Undistributed basic earnings (losses) (781) 941
Denominator for Basic and Diluted Earnings Per Share [Abstract]    
Weighted average shares, basic (in shares) 11,822 12,127
Earnings Per Share, Basic and Diluted [Abstract]    
Net income per share, basic (in dollars per share) $ (0.01) $ 0.14
Basic | Class B Common Stock
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Dividends 118 134
Undistributed basic earnings (losses) (130) 170
Denominator for Basic and Diluted Earnings Per Share [Abstract]    
Weighted average shares and shares under if-coverted method for diluted EPS, basic (in shares) $ 2,182 $ 2,428
Earnings Per Share, Basic and Diluted [Abstract]    
Net income per share, basic (in dollars per share) $ (0.01) $ 0.13
Basic | Continuing Operations
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Income from continuing operations (83) 1,979
Undistributed basic earnings (losses) (911) 1,122
Basic | Continuing Operations | Common Stock
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Dividends 710 723
Undistributed basic earnings (losses) (781) 951
Earnings Per Share, Basic and Diluted [Abstract]    
Net income per share, basic (in dollars per share) $ (0.01) $ 0.14
Basic | Continuing Operations | Class B Common Stock
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Dividends 118 134
Undistributed basic earnings (losses) (130) 171
Earnings Per Share, Basic and Diluted [Abstract]    
Net income per share, basic (in dollars per share) $ (0.01) $ 0.13
Basic | Discontinued Operations
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Undistributed basic earnings (losses) (828) (868)
Loss from discontinued operations, net of tax 0 (11)
Basic | Discontinued Operations | Common Stock
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Dividends 710 723
Undistributed basic earnings (losses) (710) (735)
Earnings Per Share, Basic and Diluted [Abstract]    
Net income per share, basic (in dollars per share) $ 0.00 $ 0.00
Basic | Discontinued Operations | Class B Common Stock
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Dividends 118 134
Undistributed basic earnings (losses) (118) (133)
Earnings Per Share, Basic and Diluted [Abstract]    
Net income per share, basic (in dollars per share) $ 0.00 $ 0.00
Diluted
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Undistributed diluted earnings (losses) (911) 1,111
Net income (loss) (83) 1,968
Denominator for Basic and Diluted Earnings Per Share [Abstract]    
Weighted average shares, diluted (in shares) 11,822 12,127
Weighted average shares and shares under if-coverted method for diluted EPS, diluted (in shares) $ 2,182 $ 2,428
Effect of dilutive securities dilutive stock options (in shares) 0 133
Denominator for diluted EPS adjusted for weighted average shares and assumed conversions (in shares) 14,004 14,688
Diluted | Common Stock
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Dividends 710 723
Undistributed diluted earnings (losses) (781) 943
Earnings Per Share, Basic and Diluted [Abstract]    
Net income per share, diluted (in dollars per share) $ (0.01) $ 0.13
Diluted | Class B Common Stock
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Dividends 118 134
Undistributed diluted earnings (losses) (130) 168
Earnings Per Share, Basic and Diluted [Abstract]    
Net income per share, diluted (in dollars per share) $ (0.01) $ 0.13
Diluted | Continuing Operations
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Income from continuing operations (83) 1,979
Undistributed diluted earnings (losses) (911) 1,122
Diluted | Continuing Operations | Common Stock
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Dividends 710 723
Undistributed diluted earnings (losses) (781) 952
Earnings Per Share, Basic and Diluted [Abstract]    
Net income per share, diluted (in dollars per share) $ (0.01) $ 0.13
Diluted | Continuing Operations | Class B Common Stock
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Dividends 118 134
Undistributed diluted earnings (losses) (130) 170
Earnings Per Share, Basic and Diluted [Abstract]    
Net income per share, diluted (in dollars per share) $ (0.01) $ 0.13
Diluted | Discontinued Operations
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Undistributed diluted earnings (losses) (828) (868)
Loss from discontinued operations, net of tax 0 (11)
Diluted | Discontinued Operations | Common Stock
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Dividends 710 723
Undistributed diluted earnings (losses) (710) (737)
Earnings Per Share, Basic and Diluted [Abstract]    
Net income per share, diluted (in dollars per share) $ 0.00 $ 0.00
Diluted | Discontinued Operations | Class B Common Stock
   
Numerator for Basic and Diluted Earnings Per Share [Abstract]    
Dividends 118 134
Undistributed diluted earnings (losses) $ (118) $ (131)
Earnings Per Share, Basic and Diluted [Abstract]    
Net income per share, diluted (in dollars per share) $ 0.00 $ 0.00