Condensed Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 3,694us-gaap_NetIncomeLoss	$ 2,856us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,788	5,042
Deferred income taxes	591us-gaap_DeferredIncomeTaxExpenseBenefit	40us-gaap_DeferredIncomeTaxExpenseBenefit
Stock based compensation	794us-gaap_ShareBasedCompensation	749us-gaap_ShareBasedCompensation
Bad debt allowance	160us-gaap_ProvisionForDoubtfulAccounts	49us-gaap_ProvisionForDoubtfulAccounts
Gain on disposal of assets	(44)us-gaap_GainLossOnDispositionOfAssets	0us-gaap_GainLossOnDispositionOfAssets
Changes in current assets and liabilities:
Trade accounts receivables	619	94
Inventory	5,146us-gaap_IncreaseDecreaseInInventories	1,068us-gaap_IncreaseDecreaseInInventories
Prepaid expenses	1,184	1,578
Accounts payable and accrued liabilities	(6,229)	(781)
Current income tax liability	307	(289)
Deferred income	(728)	(742)
Other	0	(6)
Tax benefit from equity compensation	343	(43)
NET CASH PROVIDED BY OPERATING ACTIVITIES	11,625	9,615
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(8,712)	(13,439)
Proceeds from sale of property and equipment	44	0
NET CASH USED IN INVESTING ACTIVITIES	(8,668)	(13,439)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments from other long-term liabilities, net	(7)	(9)
Repayments of line of credit, net	0us-gaap_RepaymentsOfLinesOfCredit	(80)us-gaap_RepaymentsOfLinesOfCredit
Proceeds from exercise of stock options	492	34
Taxes paid related to net share settlement of equity awards	(660)	0
Tax benefit from equity compensation	(343)	43
NET CASH USED IN FINANCING ACTIVITIES	(518)	(12)
NET CHANGE IN CASH AND CASH EQUIVALENTS	2,439	(3,836)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	6,181	24,443
CASH AND CASH EQUIVALENTS AT END OF PERIOD	8,620	20,607
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid	3us-gaap_InterestPaid	2us-gaap_InterestPaid
Income taxes paid	$ 0us-gaap_IncomeTaxesPaid	$ 0us-gaap_IncomeTaxesPaid

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-Name Accounting Standards Codification

-Glossary Financing Activities

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

+ Details

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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

+ Details

Name:	us-gaap_ShareBasedCompensation
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration