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Note 1 - Significant Accounting Policies - Impacts of Adopting ASU 2014-09 (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Accounts receivable, net of allowances $ 94,793   $ 104,153
Total assets 655,333   649,668
Accrued expenses 22,768   26,520
Deferred income taxes 65,539   63,344
Total liabilities 353,645   354,467
Retained earnings 162,479   157,471
Total stockholders’ equity 301,688   295,201
Total liabilities and stockholders’ equity 655,333   $ 649,668
Revenue from Contract with Customer, Including Assessed Tax 173,566 $ 158,744  
Salaries, wages and related expenses 60,619 59,324  
Revenue equipment rentals and purchased transportation 30,691 25,372  
Total operating expenses 167,141 158,435  
Income Tax Expense (Benefit), Total 1,538 (708)  
Net income (loss) 4,417 (39)  
Comprehensive income 5,088 (1,018)  
Deferred income tax expense 1,691 2,395  
Receivables and advances 12,995 12,039  
Accounts payable and accrued expenses (4,246) (9,081)  
Net cash flows provided by operating activities 36,696 30,667  
Cargo and Freight [Member]      
Revenue from Contract with Customer, Including Assessed Tax 150,463 $ 140,126  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Accounts receivable, net of allowances 93,502    
Total assets 654,042    
Accrued expenses 22,569    
Deferred income taxes 65,239    
Total liabilities 353,146    
Retained earnings 161,687    
Total stockholders’ equity 300,896    
Total liabilities and stockholders’ equity 654,042    
Revenue from Contract with Customer, Including Assessed Tax 173,285    
Salaries, wages and related expenses 60,634    
Revenue equipment rentals and purchased transportation 30,672    
Total operating expenses 167,137    
Income Tax Expense (Benefit), Total 1,462    
Net income (loss) 4,216    
Comprehensive income 4,887    
Deferred income tax expense 1,615    
Receivables and advances 13,276    
Accounts payable and accrued expenses (4,250)    
Net cash flows provided by operating activities 36,696    
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Cargo and Freight [Member]      
Revenue from Contract with Customer, Including Assessed Tax 150,182    
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]      
Accounts receivable, net of allowances (1,291)    
Total assets (1,291)    
Accrued expenses (199)    
Deferred income taxes (300)    
Total liabilities (499)    
Retained earnings (792)    
Total stockholders’ equity (792)    
Total liabilities and stockholders’ equity (1,291)    
Revenue from Contract with Customer, Including Assessed Tax (281)    
Salaries, wages and related expenses 15    
Revenue equipment rentals and purchased transportation (19)    
Total operating expenses (4)    
Income Tax Expense (Benefit), Total (76)    
Net income (loss) (201)    
Comprehensive income (201)    
Deferred income tax expense (76)    
Receivables and advances 281    
Accounts payable and accrued expenses (4)    
Net cash flows provided by operating activities    
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Cargo and Freight [Member]      
Revenue from Contract with Customer, Including Assessed Tax $ (281)