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Note 1 - Accounting Policies (Details Textual) - USD ($)
12 Months Ended
Jan. 24, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Bank Overdrafts   $ 3,669,000 $ 4,377,000  
Due from Employees, Current   220,000 448,000  
Other Receivables, Net, Current, Total   3,814,000 3,028,000  
Impairment of Long-Lived Assets Held-for-use   0 0  
Increase in Depreciation Expense, As Result of Adjustments to Estimated Useful Lives and Salvage Values   $ 1,000,000 2,700,000 $ 1,300,000
Period for Amortizing Prepaid Tires   2 years    
Advertising Expense   $ 1,234,000 $ 1,087,000 $ 1,019,000
Reclassification of Gain (Loss) Unrealized on Equity Securities from AOCI to Retained Earnings   (7,444,000)    
AOCI Attributable to Parent [Member]        
Reclassification of Gain (Loss) Unrealized on Equity Securities from AOCI to Retained Earnings   (7,444,000)    
Accounting Standards Update 2016-01 [Member] | AOCI Attributable to Parent [Member]        
Reclassification of Gain (Loss) Unrealized on Equity Securities from AOCI to Retained Earnings   (7,400,000)    
Line of Credit [Member]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 40,000,000    
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.50%    
Line of Credit [Member] | Subsequent Event [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 60,000,000      
Debt Instrument, Term Extension 1 year      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.25%      
Line of Credit Facility, Minimum Amount of Monthly Unused Capacity for Commitment Fee Percentage to Apply $ 18,000,000      
Line of Credit [Member] | Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate 1.25%      
Truckload Services [Member] | Sales Revenue, Services, Net [Member] | Product Concentration Risk [Member]        
Concentration Risk, Percentage   80.00% 86.30% 88.40%
Independent Contractors [Member]        
Other Receivables, Net, Current, Total   $ 1,724,000 $ 1,813,000