Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Common Class A [Member]
Stockholders' equity:
Common stock	$ 170	$ 170
Common Class B [Member]
Stockholders' equity:
Common stock	24	24
Cash and cash equivalents	8,433	4,490
Accounts receivable, net of allowance of $1,288 in 2016 and $1,857 in 2015	73,304	112,669
Drivers' advances and other receivables, net of allowance of $1,100 in 2016 and $1,005 in 2015	7,893	8,779
Inventory and supplies	4,210	4,004
Prepaid expenses	12,308	8,678
Assets held for sale	1,700	25,626
Income taxes receivable	554	8,591
Total current assets	108,402	172,837
Property and equipment, at cost	609,877	596,071
Less: accumulated depreciation and amortization	(150,442)	(142,022)
Net property and equipment	459,435	454,049
Other assets, net	19,842	19,831
Total assets	587,679	646,717
Checks outstanding in excess of bank balances		4,698
Accounts payable	10,860	12,272
Accrued expenses	23,742	30,143
Current maturities of long-term debt	29,015	39,395
Current portion of capital lease obligations	3,802	4,031
Current portion of insurance and claims accrual	15,029	17,134
Other short-term liabilities	10,419	18,549
Total current liabilities	92,867	126,222
Long-term debt	163,520	196,057
Long-term portion of capital lease obligations	9,899	10,547
Insurance and claims accrual	20,325	22,300
Deferred income taxes	72,876	76,981
Other long-term liabilities	8,405	12,450
Total liabilities	367,892	444,557
Commitments and contingent liabilities
Additional paid-in-capital	138,513	139,968
Treasury stock at cost; 78,560 and 149,498 shares as of June 30, 2016 and December 31, 2015, respectively	(1,698)	(3,408)
Accumulated other comprehensive loss	(10,403)	(17,544)
Retained earnings	93,181	82,950
Total stockholders' equity	219,787	202,160
Total liabilities and stockholders' equity	$ 587,679	$ 646,717