Consolidated Condensed Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 1,006	$ 2,907
Accounts receivable, net of allowance for doubtful accounts of $1,171 and $1,565, respectively	40,876	40,069
Tires on equipment in use, net	8,674	8,176
Equipment held for sale	0	832
Other current assets	6,441	7,840
Total current assets	56,997	59,824
Property and equipment, net	52,589	54,680
Deferred income taxes	3,039	3,039
Other assets	4,241	6,096
Total assets	116,866	123,639
Current liabilities
Accounts payable	24,778	26,178
Insurance and claims accruals	8,397	10,033
Accrued payroll and deferred compensation	4,214	3,951
Accrued liabilities	1,263	1,429
Current maturities of notes payable and capital lease obligations	3,102	3,040
Deferred income taxes	2,727	2,727
Total current liabilities	44,481	47,358
Borrowings under credit facility	25,839	26,215
Long-term notes payable and capital lease obligations	16,095	16,891
Insurance and claims accruals	5,275	4,904
Total liabilities	91,690	95,368
Shareholders' equity
Common stock, $1.50 par value per share; 75,000 shares authorized; 18,572 shares issued	27,858	27,858
Additional paid-in capital	863	1,165
Accumulated other comprehensive loss	(77)	(79)
Retained earnings	3,261	6,516
Total common shareholders' equity	31,905	35,460
Treasury stock (962 and 1,026 shares), at cost	(6,729)	(7,189)
Total shareholders' equity	25,176	28,271
Total liabilities and shareholders' equity	$ 116,866	$ 123,639