Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 4,790	$ 8,407
Accounts receivable, net of allowance of $3,361 in 2021 and $2,992 in 2020	102,736	91,295
Drivers' advances and other receivables, net of allowance of $558 in 2021 and $764 in 2020	7,122	13,624
Inventory and supplies	3,471	3,119
Prepaid expenses	13,074	11,924
Assets held for sale	9,457	15,007
Income taxes receivable	3,747	4,155
Other short-term assets	0	265
Total current assets	144,397	147,796
Property and equipment, at cost	526,135	541,276
Less: accumulated depreciation and amortization	(155,623)	(149,824)
Net property and equipment	370,512	391,452
Goodwill	42,518	42,518
Other intangibles, net	23,366	24,518
Other assets, net	65,844	60,897
Noncurrent assets of discontinued operations	1,275	9,535
Total assets	647,912	676,716
Current liabilities:
Checks outstanding in excess of bank balances	783	1,215
Accounts payable	32,421	31,695
Accrued expenses	38,646	38,538
Current maturities of long-term debt	6,065	7,577
Current portion of finance lease obligations	6,147	5,687
Current portion of operating lease obligations	16,844	16,989
Current portion of insurance and claims accrual	21,770	30,221
Other short-term liabilities	633	643
Current liabilities of discontinued operations	816	816
Total current liabilities	124,125	133,381
Long-term debt	71,803	47,888
Long-term portion of finance lease obligations	9,663	10,756
Long-term portion of operating lease obligations	17,532	21,474
Insurance and claims accrual	43,789	44,077
Deferred income taxes	71,193	74,553
Other long-term liabilities	8,050	9,794
Long-term liabilities of discontinued operations	5,100	44,151
Total liabilities	351,255	386,074
Stockholders' equity:
Additional paid-in-capital	144,874	143,438
Treasury stock at cost; 1,798,426 and 1,398,925 shares as of March 31, 2021 and December 31, 2020, respectively	(24,560)	(17,067)
Accumulated other comprehensive (loss) income	(1,319)	(2,251)
Retained earnings	177,465	166,325
Total stockholders' equity	296,657	290,642
Total liabilities and stockholders' equity	647,912	676,716
Common Class A [Member]
Stockholders' equity:
Common stock	173	173
Common Class B [Member]
Stockholders' equity:
Common stock	$ 24	$ 24