Condensed Consolidated 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 loss	$ (258)us-gaap_ProfitLoss	$ (210)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash provided by
Depreciation and amortization	5,445	5,619
Bad debt expense (recoveries)	1us-gaap_ProvisionForDoubtfulAccounts	(7)us-gaap_ProvisionForDoubtfulAccounts
Deferred income taxes	144us-gaap_DeferredIncomeTaxExpenseBenefit	(34)us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation	788us-gaap_ShareBasedCompensation	407us-gaap_ShareBasedCompensation
Loss on sale of property and equipment	(44)	(93)
Change in operating assets and liabilities:
Accounts receivable	10,768	8,851
Income tax receivable	232	0
Inventory	(236)us-gaap_IncreaseDecreaseInInventories	(819)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other	185	218
Costs and estimated earnings in excess of billings on uncompleted contracts	(2,883)	8,300
Accounts payable	1,427	(11,867)
Accrued liabilities	(2,383)	1,032
Income tax payable	(485)	(86)
Billings in excess of costs and estimated earnings on uncompleted contracts	(7,192)	(4,761)
Deferred revenue	(19)	(14)
Net cash provided by operating activities	5,490	6,536
Cash flows from investing activities:
Proceeds from sale of property and equipment	52	174
Purchase of land	0us-gaap_PaymentsToAcquireLandHeldForUse	(22,199)us-gaap_PaymentsToAcquireLandHeldForUse
Purchase of property and equipment	(5,712)	(2,005)
Net cash used in investing activities	(5,660)	(24,030)
Cash flows from financing activities:
Borrowings from Credit Facility	0us-gaap_ProceedsFromLinesOfCredit	22,500us-gaap_ProceedsFromLinesOfCredit
Payments made on borrowings from Credit Facility	(4,017)us-gaap_RepaymentsOfDebt	(389)us-gaap_RepaymentsOfDebt
Exercise of stock options	28	136
Net cash (used in) provided by financing activities	(3,989)	22,247
Net change in cash and cash equivalents	(4,159)	4,753
Cash and cash equivalents at beginning of period	38,893	40,859
Cash and cash equivalents at end of period	34,734	45,612
Supplemental disclosures of cash flow information, cash paid during the period for:
Interest	238us-gaap_InterestPaid	165us-gaap_InterestPaid
Taxes (net of refunds)	$ (33)us-gaap_IncomeTaxesPaidNet	$ (14)us-gaap_IncomeTaxesPaidNet

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The amount of cash paid for interest during the period.

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The cash outflow for acquisition of land for use; excludes purchases of land held as inventory or as investments.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration