Consolidated Condensed Balance Sheets (Current Period Unaudited) - USD ($)		Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents		$ 82,792,000	$ 56,763,000
Receivables:
Trade, net		87,044,000	83,033,000
Other		3,354,000	3,808,000
Prepaid expenses and other		19,724,000	19,924,000
Total current assets		192,914,000	163,528,000
Property and equipment:
Revenue equipment, buildings and land, office equipment and other		857,410,000	816,430,000
Accumulated depreciation		(256,836,000)	(228,200,000)
Net property and equipment		600,574,000	588,230,000
Other noncurrent assets	[1]	3,107,000	2,146,000
Total assets		796,595,000	753,904,000
Current liabilities:
Accounts payable		24,293,000	15,704,000
Insurance and claims accruals		30,907,000	28,103,000
Accrued and other current liabilities		29,976,000	28,166,000
Total current liabilities		85,176,000	71,973,000
Deferred income taxes		108,578,000	105,977,000
Noncurrent operating lease liabilities		451,000	0
Total liabilities		194,205,000	177,950,000
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; 54,633,188 shares at June 30, 2019, and 54,466,691 shares at December 31, 2018, issued and outstanding		546,000	545,000
Additional paid-in capital		77,789,000	76,814,000
Retained earnings		524,055,000	498,595,000
Total stockholders’ equity		602,390,000	575,954,000
Total liabilities and stockholders’ equity		$ 796,595,000	$ 753,904,000

[1] Operating lease assets balance at June 30, 2019.