Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 4,966	$ 8,407
Accounts receivable, net of allowance of $3,710 in 2021 and $2,992 in 2020	120,327	91,295
Drivers' advances and other receivables, net of allowance of $527 in 2021 and $764 in 2020	47,458	13,624
Inventory and supplies	3,554	3,119
Prepaid expenses	11,184	11,924
Assets held for sale	6,236	15,007
Income taxes receivable	7,150	4,155
Other short-term assets	0	265
Total current assets	200,875	147,796
Property and equipment, at cost	507,630	541,276
Less: accumulated depreciation and amortization	(156,278)	(149,824)
Net property and equipment	351,352	391,452
Goodwill	42,518	42,518
Other intangibles, net	22,214	24,518
Other assets, net	45,505	60,897
Noncurrent assets of discontinued operations	1,275	9,535
Total assets	663,739	676,716
Current liabilities:
Checks outstanding in excess of bank balances	0	1,215
Accounts payable	34,973	31,695
Accrued expenses	51,551	38,538
Current maturities of long-term debt	7,007	7,577
Current portion of finance lease obligations	6,214	5,687
Current portion of operating lease obligations	16,595	16,989
Current portion of insurance and claims accrual	61,652	30,221
Other short-term liabilities	614	643
Current liabilities of discontinued operations	816	816
Total current liabilities	179,422	133,381
Long-term debt	38,697	47,888
Long-term portion of finance lease obligations	8,748	10,756
Long-term portion of operating lease obligations	15,774	21,474
Insurance and claims accrual	20,499	44,077
Deferred income taxes	73,485	74,553
Other long-term liabilities	8,477	9,794
Long-term liabilities of discontinued operations	5,100	44,151
Total liabilities	350,202	386,074
Stockholders' equity:
Additional paid-in-capital	146,420	143,438
Treasury stock at cost; 1,769,168 and 1,398,925 shares as of June 30, 2021 and December 31, 2020, respectively	(24,351)	(17,067)
Accumulated other comprehensive (loss) income	(1,611)	(2,251)
Retained earnings	192,882	166,325
Total stockholders' equity	313,537	290,642
Total liabilities and stockholders' equity	663,739	676,716
Common Class A [Member]
Stockholders' equity:
Common stock	173	173
Common Class B [Member]
Stockholders' equity:
Common stock	$ 24	$ 24