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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ / shares in Units, $ in Thousands, shares in Millions
 3 Months Ended 12 Months Ended 18 Months Ended
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
 [2]
Jun. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
May 31, 2011
Number of Reportable Segments                     2          
Number of Asset-based Operating Fleets Aggregated in a Segment                     3          
Revenues   $ 203,306 [1] $ 178,631 $ 164,326 $ 158,744 $ 190,978 $ 164,500 $ 158,832 $ 156,341   $ 705,007 $ 670,651 $ 724,240      
Accounts Receivable, Net, Current   104,153       96,636         104,153 96,636   $ 104,153    
Allowance for Doubtful Accounts Receivable   1,456       1,345         1,456 1,345 1,857 1,456 $ 1,767  
Goodwill   0       0         0 0   0    
Insurance Policy Primary Occurence Limit   1,000                 1,000     1,000    
Workers Compensation Self Insurance Per Claim                     1,300          
Cargo Losses Purchased Coverage per Claim                     300          
Employee Annual Insuarnce Deductible Per Claim                     $ 400          
Physical Damage Coverage                     100.00%          
Drivers Advances And Other Receivables Net Of Allowance   15,062       8,757         $ 15,062 8,757   15,062    
Liability for Claims and Claims Adjustment Expense   20,000                 20,000     20,000    
Reduction in Insurance and Claims Expense                   $ 3,600            
Liability for Claims and Claims Adjustment Expense, Single Loss Limit   9,000                 9,000     9,000    
Liability for Claims and Claims Adjustment Expense, Aggregate Limit per Policy Year   18,000                 18,000     18,000    
Liability for Claims and Claims Adjustment Expense, Aggregate Three Year Limit   $ 30,000                 30,000     $ 30,000    
Auto Policy Release Premium Refund                     14,600          
Interest Costs Capitalized                     $ 100 $ 100 $ 100      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares                     0.1          
Scenario, Forecast [Member] | Accounting Standards Update 2015-14 [Member]                                
Cumulative Effect on Retained Earnings, Net of Tax $ 600                              
Tractors [Member]                                
Property, Plant and Equipment, Useful Life                     5 years          
Property, Plant and Equipment, Salvage Value, Percentage   15.00%                 15.00%     15.00%    
Tractors [Member] | Salvage Value [Member]                                
Depreciation, Additional Expense Per Quarter                           $ 2,000    
Depreciation, Additional Expense Per Quarter, After Tax                           $ 1,200    
Effect of Additional Depreciation Expense Per Quarter on Earnings Per Share | $ / shares                           $ 0.06    
Refrigerated Trailers [Member]                                
Property, Plant and Equipment, Useful Life                     7 years          
Property, Plant and Equipment, Salvage Value, Percentage   25.00%                 25.00%     25.00%    
Dry Van Trailers [Member]                                
Property, Plant and Equipment, Useful Life                     10 years          
Property, Plant and Equipment, Salvage Value, Percentage   25.00%                 25.00%     25.00%    
Collateral for Collection Issues [Member]                                
Accounts Payable   $ 600                 $ 600     $ 600    
Minimum [Member]                                
Cash Advance For Factoring Receivables Percentage                     85.00%          
Finite-Lived Intangible Asset, Useful Life                     4 years          
Minimum [Member] | Revenue Equipment [Member]                                
Property, Plant and Equipment, Useful Life                     3 years          
Capital Leases of Lessee, Term of Contract                     5 years          
Maximum [Member]                                
Cash Advance For Factoring Receivables Percentage                     95.00%          
Finite-Lived Intangible Asset, Useful Life                     20 years          
Maximum [Member] | Revenue Equipment [Member]                                
Property, Plant and Equipment, Useful Life                     10 years          
Capital Leases of Lessee, Term of Contract                     7 years          
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]                                
Concentration Risk, Percentage                     49.00% 53.00% 45.00%      
Number of Major Customers                     0 1 1      
Non Asset Operations [Member] | Solutions [Member]                                
Revenues                     $ 3,100 $ 2,600 $ 2,400      
Factoring Receivables [Member]                                
Accounts Receivable, Net, Current   31,900       25,800         31,900 25,800   31,900    
Allowance for Doubtful Accounts Receivable   200       200         200 200   200    
Receivables from Insurers [Member]                                
Drivers Advances And Other Receivables Net Of Allowance   1,100       700         1,100 700   1,100    
Self Insurance [Member]                                
Other Assets   $ 2,100       $ 100         $ 2,100 $ 100   $ 2,100    
Transport Enterprise Leasing LLC [Member]                                
Equity Method Investment, Ownership Percentage   49.00%       49.00%         49.00% 49.00%   49.00%   49.00%
[1] Includes $40.1m one-time benefit related to the Tax Cuts and Jobs Act.
[2] Adjusted from 10-Q as filed due to implementation of ASU 2016-09.