Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 14,128us-gaap_NetIncomeLoss	$ 14,390us-gaap_NetIncomeLoss	$ 12,685us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	21,507	18,144	15,707
Deferred taxes	6,840	7,723	6,972
Gain on extinguishment of liability	0	(223)	0
Gain on disposal of assets	(160)us-gaap_GainLossOnDispositionOfAssets	(48)us-gaap_GainLossOnDispositionOfAssets	0us-gaap_GainLossOnDispositionOfAssets
Inventory allowance	395us-gaap_InventoryWriteDown	0us-gaap_InventoryWriteDown	0us-gaap_InventoryWriteDown
Stock based compensation	3,244us-gaap_ShareBasedCompensation	1,682us-gaap_ShareBasedCompensation	1,418us-gaap_ShareBasedCompensation
Changes in current assets (increase) decrease in:
Trade accounts receivables	(3,658)	(59)	(1,012)
Inventory	(6,112)us-gaap_IncreaseDecreaseInInventories	(323)us-gaap_IncreaseDecreaseInInventories	456us-gaap_IncreaseDecreaseInInventories
Prepaid income taxes and prepaid expenses	(3,997)	(1,870)	(281)
Changes in current liabilities increase (decrease) in:
Accounts payable and accrued liabilities	1,126	1,154	1,863
Current income tax liability	920	(162)	447
Deferred income	762	(1,154)	(2,836)
Other	(12)	0	(1)
Tax benefit from equity compensation	(419)	(10)	0
NET CASH PROVIDED BY OPERATING ACTIVITIES	34,564	39,244	35,418
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of rental, property and equipment	(53,342)	(43,419)	(23,766)
Proceeds from sale of property and equipment	240	95	5
NET CASH USED IN INVESTING ACTIVITIES	(53,102)	(43,324)	(23,761)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments of other long-term liabilities, net	(42)	(82)	(21)
Repayments of line of credit, net	(160)us-gaap_RepaymentsOfLinesOfCredit	(320)us-gaap_RepaymentsOfLinesOfCredit	(120)us-gaap_RepaymentsOfLinesOfCredit
Tax benefit from equity compensation	419	10	0
Proceeds from exercise of stock options	59	829	180
NET CASH PROVIDED BY FINANCING ACTIVITIES	276	437	39
NET CHANGE IN CASH AND CASH EQUIVALENTS	(18,262)	(3,643)	11,696
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	24,443	28,086	16,390
CASH AND CASH EQUIVALENTS AT END OF PERIOD	6,181	24,443	28,086
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid	10us-gaap_InterestPaid	56us-gaap_InterestPaid	18us-gaap_InterestPaid
Income taxes paid	4,108us-gaap_IncomeTaxesPaid	2,590us-gaap_IncomeTaxesPaid	267us-gaap_IncomeTaxesPaid
NON-CASH TRANSACTIONS
Transfer of rental equipment to inventory	131	207	8,690
Property and equipment purchases included in accounts payable	$ 218	$ 251	$ 31

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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- Details

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