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Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income applicable to common shares $ 12,685 $ 9,760 $ 7,028
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 15,707 13,994 11,927
Deferred taxes 6,972 5,869 4,248
Stock based compensation 1,418 1,068 1,058
Gain on disposal of assets 0 (717) (46)
Changes in current assets:      
Trade accounts receivables (1,012) (400) 2,035
Inventory 456 (5,476) 2,773
Prepaid income taxes and prepaid expenses (281) 1,964 (598)
Changes in current liabilities:      
Accounts payable and accrued liabilities 1,863 1,859 1,791
Current income tax liability 447 1,229 (1,708)
Deferred income (2,836) 4,474 299
Other (1) (1) (9)
NET CASH PROVIDED BY OPERATING ACTIVITIES 35,418 33,623 28,798
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchases of property and equipment (23,766) (36,525) (21,908)
Proceeds from sale of property and equipment 5 1,019 47
NET CASH USED IN INVESTING ACTIVITIES (23,761) (35,506) (21,861)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from line of credit 0 0 2,000
Proceeds from other long-term liabilities, net (21) (4) (30)
Repayments of long-term debt 0 0 (6,194)
Repayments of line of credit (120) (983) (7,000)
Proceeds from exercise of stock options 180 123 407
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES 39 (864) (10,817)
NET CHANGE IN CASH AND CASH EQUIVALENTS 11,696 (2,747) (3,880)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 16,390 19,137 23,017
CASH AND CASH EQUIVALENTS AT END OF PERIOD 28,086 16,390 19,137
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:      
Interest paid 18 61 238
Income taxes paid 267 130 2,204
NON-CASH TRANSACTIONS      
Transfer of rental equipment to inventory $ 8,690 $ 0 $ 225