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Note 3 - Business Combination - Acquisition of Zenith (Details Textual)
$ / shares in Units, $ in Thousands
2 Months Ended 3 Months Ended 6 Months Ended
Feb. 02, 2015
USD ($)
Feb. 01, 2015
USD ($)
May 28, 2016
USD ($)
May 30, 2015
USD ($)
Feb. 28, 2015
USD ($)
$ / shares
May 28, 2016
USD ($)
May 30, 2015
USD ($)
Nov. 28, 2015
USD ($)
Zenith Freight Lines [Member] | Long-term Debt [Member]                
Debt Instrument, Periodic Payment $ 3,000              
Zenith Freight Lines [Member]                
Equity Method Investment, Ownership Percentage   49.00%            
Business Acquisition, Percentage of Voting Interests Acquired 51.00%       51.00%      
Business Combination, Consideration Transferred $ 19,111       $ 19,111      
Debt Instrument, Periodic Payment, Number of Installments 3              
Equity Method Investments, Carrying Value Prior to Step Acquisition Remeasurement   $ 9,480            
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value         $ 16,692   $ 16,692  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain             7,212  
Basic Earnings Per Share Adjustment | $ / shares         $ 0.42      
Business Acquisition, Goodwill, Expected Tax Deductible Amount               $ 6,982
Business Combination, Acquisition Related Costs       $ 88     209  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain       $ 7,212