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Note 1 - Summary of Significant Accounting Policies (Details Textual)
shares in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2013
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
 [2]
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
 [3]
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
May. 31, 2011
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]                              
Number of Major Customers 0                   1 1      
Concentration Risk, Percentage                     45.00% 38.00% 34.00%    
Self Insurance [Member]                              
Other Assets   $ 600,000       $ 600,000         $ 600,000 $ 600,000      
Collateral for Collection Issues [Member]                              
Accounts Payable   400,000                 400,000        
Factoring Receivables [Member]                              
Allowance for Doubtful Accounts Receivable   200,000       200,000         200,000 200,000      
Accounts Receivable, Net, Current   $ 18,900,000       15,800,000         18,900,000 15,800,000      
Non Asset Operations [Member] | Solutions [Member]                              
Revenues                     $ 2,400,000 2,300,000 $ 1,700,000    
Receivables from Insurers [Member]                              
Drivers Advances And Other Receivables Net Of Allowance           100,000           100,000      
Transport Enterprise Leasing LLC [Member]                              
Equity Method Investment, Ownership Percentage   49.00%                 49.00%       49.00%
Unspecified Customer [Member]                              
Revenues                     $ 75,800,000 82,500,000      
Minimum [Member] | Revenue Equipment [Member]                              
Property, Plant and Equipment, Useful Life                     3 years        
Capital Leases of Lessee, Term of Contract                     5 years        
Minimum [Member]                              
Cash Advance For Factoring Receivables Percentage                     85.00%        
Finite-Lived Intangible Asset, Useful Life                     4 years        
Maximum [Member] | Revenue Equipment [Member]                              
Property, Plant and Equipment, Useful Life                     10 years        
Capital Leases of Lessee, Term of Contract                     7 years        
Maximum [Member]                              
Cash Advance For Factoring Receivables Percentage                     95.00%        
Finite-Lived Intangible Asset, Useful Life                     20 years        
Tractors [Member]                              
Property, Plant and Equipment, Useful Life                     5 years        
Property, Plant and Equipment, Salvage Value, Percentage   25.00%                 25.00%        
Refrigerated Trailers [Member]                              
Property, Plant and Equipment, Useful Life                     6 years        
Dry Van Trailers [Member]                              
Property, Plant and Equipment, Salvage Value, Percentage   38.00%                 38.00%        
Single Loss [Member]                              
Liability for Claims and Claims Adjustment Expense   $ 9,000,000                 $ 9,000,000        
Each Policy Year [Member]                              
Liability for Claims and Claims Adjustment Expense   18,000,000                 18,000,000        
Aggregate for 3 Years Ended March 31, 2016 [Member]                              
Liability for Claims and Claims Adjustment Expense   30,000,000                 30,000,000        
Reclassification of Debt Issuance Costs from Other Assets to Long-term Notes Payable [Member] | December 31, 2015 [Member] | Scenario, Forecast [Member]                              
Prior Period Reclassification Adjustment                   $ 700,000          
Goodwill   0       0         0 0      
Interest Costs Capitalized                     100,000 100,000 100,000    
Allowance for Doubtful Accounts Receivable   1,857,000       1,767,000         $ 1,857,000 1,767,000 1,736,000 $ 1,729,000  
Number of Asset-based Operating Fleets Aggregated in a Segment                     3        
Revenues   208,061,000 $ 173,512,000 $ 175,451,000 [1] $ 167,216,000 206,788,000 $ 177,581,000 $ 173,654,000 $ 160,957,000   $ 724,240,000 718,980,000 $ 684,549,000    
Accounts Receivable, Net, Current   112,669,000       95,943,000         112,669,000 95,943,000      
Insurance Policy Primary Occurence Limit   1,000,000                 1,000,000        
Workers Compensation Self Insurance Per Claim                     1,300,000        
Cargo Losses Purchased Coverage per Claim                     300,000        
Employee Annual Insuarnce Deductible Per Claim                     $ 400,000        
Physical Damage Coverage                     100.00%        
Drivers Advances And Other Receivables Net Of Allowance   8,779,000       $ 5,770,000         $ 8,779,000 $ 5,770,000      
Liability for Claims and Claims Adjustment Expense   $ 20,000,000                 20,000,000        
Reduction in Insurance and Claims Expense       $ 3,600,000                      
Auto Policy Release Premium Refund                     $ 14,700,000        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares                     0.1        
[1] includes $3.6 million in return of previously expensed insurance premiums for the commutation of our primary auto liability policy for the period of April 1, 2013, through September 30, 2014.
[2] Includes $4.7 million after tax one-time federal income tax credit.
[3] Includes $7.5 million increase to claims reserves for a 2008 cargo claim.