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Note 16 - Segment Information - Segment Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
 [1]
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
 [2]
Mar. 31, 2015
 [3]
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues $ 190,978,000 $ 164,500,000 $ 158,832,000 $ 156,341,000 $ 208,061,000 $ 173,512,000 $ 175,451,000 $ 167,216,000 $ 670,651,000 $ 724,240,000 $ 718,980,000
Operating income (loss) 12,267,000 $ 5,446,000 $ 7,316,000 $ 7,418,000 24,336,000 $ 14,629,000 $ 18,774,000 $ 10,043,000 32,447,000 67,782,000 39,646,000
Total assets 620,538,000       646,717,000       620,538,000 646,717,000  
Operating Segments [Member]                      
Revenues                 674,828,000 726,975,000 722,797,000
Operating income (loss)                 32,447,000 67,782,000 39,646,000
Depreciation and amortization (1) [4]                 72,456,000 61,384,000 46,384,000
Total assets 620,538,000       646,717,000       620,538,000 646,717,000 539,304,000
Capital expenditures, net (2) [5]                 59,052,000 148,994,000 89,455,000
Operating Segments [Member] | Truckload [Member]                      
Revenues                 601,226,000 655,918,000 663,001,000
Operating income (loss)                 37,031,000 74,107,000 54,151,000
Depreciation and amortization (1) [4]                 71,173,000 60,138,000 45,669,000
Total assets 548,882,000       580,506,000       548,882,000 580,506,000 463,900,000
Capital expenditures, net (2) [5]                 57,242,000 147,896,000 87,871,000
Operating Segments [Member] | Other Segments [Member]                      
Revenues                 73,602,000 71,057,000 59,796,000
Operating income (loss)                 7,631,000 5,768,000 3,894,000
Depreciation and amortization (1) [4]                 22,000 13,000 59,000
Total assets 31,289,000       26,315,000       31,289,000 26,315,000 27,338,000
Capital expenditures, net (2) [5]                 43,000 29,000 14,000
Operating Segments [Member] | Corporate Segment [Member]                      
Revenues                
Operating income (loss)                 (12,215,000) (12,093,000) (18,399,000)
Depreciation and amortization (1) [4]                 1,261,000 1,233,000 656,000
Total assets $ 40,367,000       $ 39,896,000       40,367,000 39,896,000 48,066,000
Capital expenditures, net (2) [5]                 1,767,000 1,069,000 1,570,000
Intersegment Eliminations [Member]                      
Revenues                 (4,177,000) (2,735,000) (3,817,000)
Intersegment Eliminations [Member] | Truckload [Member]                      
Revenues                
Intersegment Eliminations [Member] | Other Segments [Member]                      
Revenues                 (4,177,000) (2,735,000) (3,817,000)
Intersegment Eliminations [Member] | Corporate Segment [Member]                      
Revenues                
[1] Adjusted from 10-Q as filed due to implementation of ASU 2016-09.
[2] 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.
[3] Includes $4.7 million after tax one-time federal income tax credit.
[4] Includes gains and losses on disposition of equipment .
[5] Includes equipment purchased under capital leases.