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Note 1 - Significant Accounting Policies - Impacts of Adopting ASU 2014-09 (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Accounts receivable, net of allowances $ 134,957   $ 134,957   $ 104,153
Total assets 747,482   747,482   649,668
Accrued expenses 47,797   47,797   26,520
Deferred income taxes 73,347   73,347   63,344
Total liabilities 421,332   421,332   354,467
Retained earnings 184,064   184,064   157,471
Total stockholders’ equity 326,150   326,150   295,201
Total liabilities and stockholders’ equity 747,482   747,482   $ 649,668
Revenue from Contract with Customer, Including Assessed Tax 243,303 $ 178,631 613,187 $ 501,701  
Labor and Related Expense 86,249 60,732 211,621 178,639  
Revenue equipment rentals and purchased transportation 47,445 36,361 115,525 90,719  
Operating Expenses, Total 227,122 169,590 576,516 488,389  
Income Tax Expense (Benefit), Total 4,249 2,985 9,716 3,530  
Net income 11,614 4,632 26,002 6,141  
Comprehensive income 11,558 6,987 27,196 7,339  
Deferred income tax expense 2,676   9,172 16,437  
Receivables and advances (16,537)   (4,717) (19,975)  
Accounts payable and accrued expenses 16,087   17,723 (400)  
Net cash flows provided by operating activities 38,981   101,614 62,787  
Cargo and Freight [Member]          
Revenue from Contract with Customer, Including Assessed Tax 214,623 $ 159,500 535,721 $ 445,212  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]          
Accounts receivable, net of allowances 133,681   133,681    
Total assets 746,206   746,206    
Accrued expenses 47,561   47,561    
Deferred income taxes 73,061   73,061    
Total liabilities 420,810   420,810    
Retained earnings 183,310   183,310    
Total stockholders’ equity 325,396   325,396    
Total liabilities and stockholders’ equity 746,206   746,206    
Revenue from Contract with Customer, Including Assessed Tax 243,352   612,921    
Labor and Related Expense 86,248   211,634    
Revenue equipment rentals and purchased transportation 47,350   115,471    
Operating Expenses, Total 227,026   576,475    
Income Tax Expense (Benefit), Total 4,289   9,654    
Net income 11,719   25,838    
Comprehensive income 11,663   27,032    
Deferred income tax expense 2,716   9,110    
Receivables and advances (16,586)   (4,451)    
Accounts payable and accrued expenses 15,991   17,682    
Net cash flows provided by operating activities 38,981   101,612    
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Cargo and Freight [Member]          
Revenue from Contract with Customer, Including Assessed Tax 214,672   535,455    
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]          
Accounts receivable, net of allowances (1,276)   (1,276)    
Total assets (1,276)   (1,276)    
Accrued expenses (236)   (236)    
Deferred income taxes (286)   (286)    
Total liabilities (522)   (522)    
Retained earnings (754)   (754)    
Total stockholders’ equity (754)   (754)    
Total liabilities and stockholders’ equity (1,276)   (1,276)    
Revenue from Contract with Customer, Including Assessed Tax 49   (266)    
Labor and Related Expense (1)   13    
Revenue equipment rentals and purchased transportation (95)   (54)    
Operating Expenses, Total (96)   (41)    
Income Tax Expense (Benefit), Total 40   (62)    
Net income 105   (164)    
Comprehensive income 105   (163)    
Deferred income tax expense 40   (62)    
Receivables and advances (49)   266    
Accounts payable and accrued expenses (96)   (41)    
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 $ 49   $ (266)