Consolidated 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	$ 13,077us-gaap_NetIncomeLoss	$ 6,557us-gaap_NetIncomeLoss	$ 10,850us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,268	6,647	1,250
Non-cash interest expense	561us-gaap_AmortizationOfFinancingCosts	304us-gaap_AmortizationOfFinancingCosts	227us-gaap_AmortizationOfFinancingCosts
Gain on sale of property and equipment	(62)	(97)	(70)
Share based compensation expense	1,659us-gaap_ShareBasedCompensation	1,100us-gaap_ShareBasedCompensation	662us-gaap_ShareBasedCompensation
Bad debt expense	299us-gaap_ProvisionForLoanAndLeaseLosses	99us-gaap_ProvisionForLoanAndLeaseLosses	176us-gaap_ProvisionForLoanAndLeaseLosses
Inventory reserve expense (benefit)	566	(105)	102
Excess tax benefit from stock options exercised	(923)
Deferred income tax (benefit) expense	(3,183)us-gaap_DeferredIncomeTaxExpenseBenefit	1,126us-gaap_DeferredIncomeTaxExpenseBenefit	454us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	2,492	2,753	(5,089)
Inventories	1,993us-gaap_IncreaseDecreaseInInventories	1,680us-gaap_IncreaseDecreaseInInventories	458us-gaap_IncreaseDecreaseInInventories
Costs and estimated earnings in excess of billings on uncompleted contracts	(6,625)	(941)	4,823
Prepaid expenses and other current assets	577	1,894	527
Deferred charges and other assets	789	567	203
Accounts payable and accrued expenses	1,465	4,472	319
Accrued litigation settlement	(2,536)us-gaap_PaymentsForLegalSettlements
Billings in excess of costs and estimated earnings on uncompleted contracts	(2,169)	(2,147)	1,303
Income taxes payable	(1,164)	(134)	465
Other liabilities	(1,821)	406	169
Net cash provided by operating activities	16,263	24,181	16,829
Cash flows from investing activities:
Acquisitions of property and equipment	(1,151)	(1,377)	(273)
Net cash paid for acquisitions	(44,399)	(104,432)	(4,000)
Net proceeds from sale of assets	7,738	215	382
Net cash used in investing activities	(37,812)	(105,594)	(3,891)
Cash flows from financing activities:
Net (repayments) borrowings on revolving credit lines	(2,909)us-gaap_ProceedsFromLinesOfCredit	3,366us-gaap_ProceedsFromLinesOfCredit
Borrowings of long-term debt	35,000	100,000
Repayments of long-term debt	(8,867)us-gaap_RepaymentsOfLongTermDebt	(14,218)us-gaap_RepaymentsOfLongTermDebt
Deferred financing fees paid	(370)us-gaap_PaymentsOfFinancingCosts	(2,730)us-gaap_PaymentsOfFinancingCosts
Proceeds from exercise of stock options	1,383	1,364	248
Cash paid for repurchase of common shares	(973)	(2,365)	(456)
Excess tax benefit from stock options exercised	923
Dividends paid to common shareholders	(5,937)us-gaap_PaymentsOfDividendsCommonStock	(4,337)us-gaap_PaymentsOfDividendsCommonStock	(2,460)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by (used in) financing activities	18,250	81,080	(2,668)
Net (decrease) increase in cash and cash equivalents	(3,299)	(333)	10,270
Cash and cash equivalents at beginning of year	22,661	22,994	12,724
Cash and cash equivalents at end of year	19,362	22,661	22,994
Supplemental Schedule of Non-Cash Investing and Financing Activities:
Conversion of subordinated debt to common stock			9,600
Common stock issued in business acquisitions	6,335us-gaap_StockIssued1	104,753us-gaap_StockIssued1	521us-gaap_StockIssued1
Cash paid during the year for:
Interest	2,816us-gaap_InterestPaid	1,838us-gaap_InterestPaid	946us-gaap_InterestPaid
Income taxes	$ 8,665us-gaap_IncomeTaxesPaidNet	$ 2,237us-gaap_IncomeTaxesPaidNet	$ 2,637us-gaap_IncomeTaxesPaidNet

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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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.

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Amount of expense related to estimated loss from loan and lease transactions.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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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.

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The fair value of stock issued in noncash financing activities.

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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.

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