Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 8,277	$ 7,750
Accounts receivable, net of allowance of $1,471 in 2017 and $1,345 in 2016	92,037	96,636
Drivers' advances and other receivables, net of allowance of $512 in 2017 and $519 in 2016	14,947	8,757
Inventory and supplies	4,049	3,980
Prepaid expenses	9,044	10,889
Assets held for sale	2,214	2,695
Income taxes receivable	17,634	4,256
Other short-term assets	1,008
Total current assets	149,210	134,963
Property and equipment, at cost	662,423	631,076
Less: accumulated depreciation and amortization	(186,401)	(165,605)
Net property and equipment	476,022	465,471
Other assets, net	25,057	20,104
Total assets	650,289	620,538
Current liabilities:
Checks outstanding in excess of bank balances	1,514	189
Accounts payable	12,374	13,032
Accrued expenses	27,863	26,607
Current maturities of long-term debt	28,775	24,947
Current portion of capital lease obligations	2,941	2,441
Current portion of insurance and claims accrual	14,681	17,177
Other short-term liabilities	1,718	3,388
Total current liabilities	89,866	87,781
Long-term debt	165,592	168,676
Long-term portion of capital lease obligations	22,525	19,761
Insurance and claims accrual	24,199	20,866
Deferred income taxes	101,440	84,157
Other long-term liabilities	2,275	2,883
Total liabilities	405,897	384,124
Commitments and contingent liabilities
Stockholders' equity:
Additional paid-in-capital	137,467	137,912
Treasury stock at cost; no shares as of September 30, 2017 and 23,656 shares as of December 31, 2016		(1,084)
Accumulated other comprehensive loss	(1,442)	(2,640)
Retained earnings	108,173	102,032
Total stockholders' equity	244,392	236,414
Total liabilities and stockholders' equity	650,289	620,538
Common Class A [Member]
Stockholders' equity:
Common stock	170	170
Common Class B [Member]
Stockholders' equity:
Common stock	$ 24	$ 24