Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 198us-gaap_NetIncomeLoss	$ 3,021us-gaap_NetIncomeLoss
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,452	2,770
Gain on sale of property and equipment		(15)
Non-cash interest expense included in net income	161us-gaap_AmortizationOfFinancingCosts	137us-gaap_AmortizationOfFinancingCosts
Share-based compensation expense	463us-gaap_ShareBasedCompensation	375us-gaap_ShareBasedCompensation
Bad debt expense	45us-gaap_ProvisionForLoanAndLeaseLosses	57us-gaap_ProvisionForLoanAndLeaseLosses
Inventory reserve expense	129	182
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(844)	861
Costs and estimated earnings in excess of billings on uncompleted contracts	(7,614)	737
Inventories	(531)us-gaap_IncreaseDecreaseInInventories	215us-gaap_IncreaseDecreaseInInventories
Prepaid expense and other current assets	234	(31)
Deferred charges and other assets	443	(160)
Accrued litigation settlement		(2,536)us-gaap_PaymentsForLegalSettlements
Accounts payable and accrued expenses	4,312	(4,209)
Billings in excess of costs and estimated earnings on uncompleted contracts	432	(1,206)
Income taxes payable	(140)	658
Other liabilities	220	19
Net cash provided by operating activities	960	875
Cash flows from investing activities:
Acquisitions of property and equipment	(119)	(415)
Proceeds from sale of property and equipment	100	4,814
Net cash (used in) provided by investing activities	(19)	4,399
Cash flows from financing activities:
Net borrowings on revolving credit lines	2,589us-gaap_ProceedsFromLinesOfCredit
Repayments of debt	(2,234)us-gaap_ProceedsFromRepaymentsOfDebt	(7,012)us-gaap_ProceedsFromRepaymentsOfDebt
Proceeds from employee stock purchase plan and exercise of stock options	71	561
Repurchases of common stock		(973)
Dividends paid to common shareholders	(1,739)us-gaap_PaymentsOfDividendsCommonStock	(1,284)us-gaap_PaymentsOfDividendsCommonStock
Net cash used in financing activities	(1,313)	(8,708)
Net decrease in cash and cash equivalents	(372)	(3,434)
Cash and cash equivalents at beginning of period	19,362	22,661
Cash and cash equivalents at end of period	18,990	19,227
Cash paid (refunded) during the period for:
Interest	792us-gaap_InterestPaid	759us-gaap_InterestPaid
Income taxes	$ (1,561)us-gaap_IncomeTaxesPaidNet	$ 553us-gaap_IncomeTaxesPaidNet

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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
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

+ Details

Name:	us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration