Consolidated Condensed Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 9,065	$ 488
Receivables:
Trade, net	69,808	69,199
Other	3,714	4,436
Prepaid expenses and other	17,102	19,307
Total current assets	99,689	93,430
Property and equipment:
Revenue equipment, buildings and land, office equipment and other	768,856	759,553
Accumulated depreciation	(209,226)	(201,728)
Net property and equipment	559,630	557,825
Other assets	1,966	2,493
Total assets	661,285	653,748
Current liabilities:
Accounts payable and accrued liabilities	43,981	41,230
Insurance and claims accruals	20,582	19,440
Total current liabilities	64,563	60,670
Long-term debt		7,886
Deferred income taxes	151,270	147,854
Total liabilities	215,833	216,410
Stockholders’ equity:
Preferred stock, $.01 par value per share; 2,000,000 shares authorized; no shares issued and outstanding
Common stock, $.01 par value per share; 96,000,000 shares authorized; 32,684,955 shares at March 31, 2017, and 32,634,915 shares at December 31, 2016, issued and outstanding	327	326
Additional paid-in capital	74,891	74,175
Retained earnings	370,234	362,837
Total stockholders’ equity	445,452	437,338
Total liabilities and stockholders’ equity	$ 661,285	$ 653,748

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

Name:	us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.