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Note 3 - Business Combination - Acquisition of Zenith (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 02, 2015
USD ($)
Feb. 01, 2015
USD ($)
May. 30, 2015
USD ($)
May. 30, 2015
USD ($)
$ / shares
Note 3 - Business Combination - Acquisition of Zenith (Details) [Line Items]        
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain       $ 7,212
Zenith Freight Lines [Member]        
Note 3 - Business Combination - Acquisition of Zenith (Details) [Line Items]        
Equity Method Investment, Ownership Percentage   49.00%    
Equity Method Investments, Carrying Value Prior to Step Acquisition Remeasurement   $ 9,480    
Zenith Freight Lines [Member]        
Note 3 - Business Combination - Acquisition of Zenith (Details) [Line Items]        
Equity Method Investment, Ownership Percentage     49.00% 49.00%
Business Acquisition, Percentage of Voting Interests Acquired 51.00%   51.00% 51.00%
Business Combination, Consideration Transferred $ 19,111     $ 19,111
Debt Instrument, Periodic Payment, Number of Instalments 3      
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value       16,692
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain       $ 7,212
Basic Earnings Per Share, Adjustment (in Dollars per share) | $ / shares       $ 0.42
Diluted Earnings Per Share, Adjustment (in Dollars per share) | $ / shares       $ 0.41
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual     $ 12,086 $ 15,345
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual     603 591
Zenith Freight Lines [Member] | Selling, General and Administrative Expenses [Member]        
Note 3 - Business Combination - Acquisition of Zenith (Details) [Line Items]        
Business Combination, Acquisition Related Costs     $ 88 $ 209
Long-term Debt [Member] | Zenith Freight Lines [Member]        
Note 3 - Business Combination - Acquisition of Zenith (Details) [Line Items]        
Debt Instrument, Periodic Payment $ 3,000