Consolidated Condensed Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 80,672	$ 66,127
Trade, net	92,920	83,426
Other	4,904	4,202
Prepaid expenses and other	23,444	21,903
Total current assets	201,940	175,658
Property and equipment:
Revenue equipment, buildings and land, office equipment and other	947,071	930,123
Accumulated depreciation	(266,342)	(275,950)
Net property and equipment	680,729	654,173
Other noncurrent assets	1,694	1,805
Total assets	884,363	831,636
Current liabilities:
Accounts payable	39,279	25,702
Insurance and claims accruals	41,438	39,595
Accrued and other current liabilities	26,272	24,497
Total current liabilities	106,989	89,794
Deferred income taxes	123,312	121,098
Noncurrent operating lease liabilities	421	411
Total liabilities	230,722	211,303
Stockholders’ equity:
Preferred stock, $.01 par value per share; 2,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $.01 par value per share; 192,000,000 shares authorized; 82,880,930 shares at June 30, 2021, and 82,705,005 shares at December 31, 2020, issued and outstanding	829	827
Additional paid-in capital	85,578	85,070
Retained earnings	567,234	534,436
Total stockholders’ equity	653,641	620,333
Total liabilities and stockholders’ equity	$ 884,363	$ 831,636