Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 8,412	$ 8,407
Accounts receivable, net of allowance of $4,112 in 2021 and $2,992 in 2020	142,362	91,295
Drivers' advances and other receivables, net of allowance of $542 in 2021 and $764 in 2020	8,792	13,624
Inventory and supplies	3,323	3,119
Prepaid expenses	12,536	11,924
Assets held for sale	2,925	15,007
Income taxes receivable	10,177	4,155
Other short-term assets	0	265
Total current assets	188,527	147,796
Property and equipment, at cost	518,406	541,276
Less: accumulated depreciation and amortization	(171,923)	(149,824)
Net property and equipment	346,483	391,452
Goodwill	42,518	42,518
Other intangibles, net	20,475	24,518
Other assets	52,384	60,897
Noncurrent assets from discontinued operations	1,275	9,535
Total assets	651,662	676,716
Current liabilities:
Checks outstanding in excess of bank balances	0	1,215
Accounts payable	29,907	31,695
Accrued expenses	38,001	27,830
Accrued purchased transportation	24,689	10,708
Current maturities of long-term debt	5,722	7,577
Current portion of finance lease obligations	6,848	5,687
Current portion of operating lease obligations	15,811	16,989
Current portion of insurance and claims accrual	21,210	30,221
Other short-term liabilities	557	643
Current liabilities of discontinued operations, net	0	816
Total current liabilities	142,745	133,381
Long-term debt	20,347	47,888
Long-term portion of finance lease obligations	3,969	10,756
Long-term portion of operating lease obligations	21,554	21,474
Insurance and claims accrual	21,438	44,077
Deferred income taxes	84,661	74,553
Other long-term liabilities	2,149	9,794
Other long-term liabilities of discontinued operations	5,100	44,151
Total liabilities	301,963	386,074
Commitments and contingencies
Stockholders' equity:
Additional paid-in-capital	149,406	143,438
Treasury stock at cost; 1,711,627 and 1,398,925 shares as of December 31, 2021 and December 31, 2020, respectively	(23,662)	(17,067)
Accumulated other comprehensive loss	(1,306)	(2,251)
Retained earnings	225,076	166,325
Total stockholders' equity	349,699	290,642
Total liabilities and stockholders' equity	651,662	676,716
Common Class A [Member]
Stockholders' equity:
Common stock	161	173
Common Class B [Member]
Stockholders' equity:
Common stock	$ 24	$ 24