Consolidated Condensed Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 88,583	$ 66,127
Trade, net	89,552	83,426
Other	3,489	4,202
Prepaid expenses and other	19,434	21,903
Total current assets	201,058	175,658
Property and equipment:
Revenue equipment, buildings and land, office equipment and other	934,405	930,123
Accumulated depreciation	(281,812)	(275,950)
Net property and equipment	652,593	654,173
Other noncurrent assets	1,698	1,805
Total assets	855,349	831,636
Current liabilities:
Accounts payable	32,060	25,702
Insurance and claims accruals	41,712	39,595
Accrued and other current liabilities	24,079	24,497
Total current liabilities	97,851	89,794
Deferred income taxes	122,183	121,098
Noncurrent operating lease liabilities	337	411
Total liabilities	220,371	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; 82,774,936 shares at March 31, 2021, and 82,705,005 shares at December 31, 2020, issued and outstanding	828	827
Additional paid-in capital	85,019	85,070
Retained earnings	549,131	534,436
Total stockholders’ equity	634,978	620,333
Total liabilities and stockholders’ equity	$ 855,349	$ 831,636