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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 02, 2015	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Jan. 02, 2015	Dec. 27, 2013	Dec. 28, 2012
Revenue:
Revenue before reimbursements									$ 213,519us-gaap_SalesRevenueServicesNet	$ 200,391us-gaap_SalesRevenueServicesNet	$ 199,749us-gaap_SalesRevenueServicesNet
Reimbursements									23,218us-gaap_ReimbursementRevenue	23,439us-gaap_ReimbursementRevenue	22,987us-gaap_ReimbursementRevenue
Total revenue	60,343us-gaap_Revenues	60,437us-gaap_Revenues	61,052us-gaap_Revenues	54,905us-gaap_Revenues	52,604us-gaap_Revenues	57,916us-gaap_Revenues	58,961us-gaap_Revenues	54,349us-gaap_Revenues	236,737us-gaap_Revenues	223,830us-gaap_Revenues	222,736us-gaap_Revenues
Cost of service:
Personnel costs before reimbursable expenses (includes $3,556, $3,284 and $2,990 of stock compensation expense in 2014, 2013 and 2012, respectively)									138,958us-gaap_CostOfServices	130,456us-gaap_CostOfServices	125,912us-gaap_CostOfServices
Reimbursable expenses									23,218us-gaap_CostOfReimbursableExpense	23,439us-gaap_CostOfReimbursableExpense	22,987us-gaap_CostOfReimbursableExpense
Total cost of service									162,176us-gaap_CostOfRevenue	153,895us-gaap_CostOfRevenue	148,899us-gaap_CostOfRevenue
Selling, general and administrative costs (includes $2,814, $2,835 and $2,524 of stock compensation expense in 2014, 2013 and 2012, respectively)									61,386us-gaap_SellingGeneralAndAdministrativeExpense	54,208us-gaap_SellingGeneralAndAdministrativeExpense	56,997us-gaap_SellingGeneralAndAdministrativeExpense
Bargain purchase gain from acquisition									(3,015)us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
Restructuring costs (benefit)				3,600us-gaap_RestructuringCosts					3,604us-gaap_RestructuringCosts		(211)us-gaap_RestructuringCosts
Total costs and operating expenses									224,151us-gaap_CostsAndExpenses	208,103us-gaap_CostsAndExpenses	205,685us-gaap_CostsAndExpenses
Operating income	4,181us-gaap_OperatingIncomeLoss	5,059us-gaap_OperatingIncomeLoss	5,026us-gaap_OperatingIncomeLoss	(1,680)us-gaap_OperatingIncomeLoss	2,396us-gaap_OperatingIncomeLoss	4,717us-gaap_OperatingIncomeLoss	5,085us-gaap_OperatingIncomeLoss	3,529us-gaap_OperatingIncomeLoss	12,586us-gaap_OperatingIncomeLoss	15,727us-gaap_OperatingIncomeLoss	17,051us-gaap_OperatingIncomeLoss
Other income (expense):
Interest income									6us-gaap_InvestmentIncomeInterest	7us-gaap_InvestmentIncomeInterest	20us-gaap_InvestmentIncomeInterest
Interest expense									(626)us-gaap_InterestExpense	(472)us-gaap_InterestExpense	(630)us-gaap_InterestExpense
Income from continuing operations before income taxes									11,966us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	15,262us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	16,441us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense (benefit)									2,255us-gaap_IncomeTaxExpenseBenefit	6,398us-gaap_IncomeTaxExpenseBenefit	(478)us-gaap_IncomeTaxExpenseBenefit
Income from continuing operations	4,691us-gaap_IncomeLossFromContinuingOperations	3,591us-gaap_IncomeLossFromContinuingOperations	3,475us-gaap_IncomeLossFromContinuingOperations	(2,046)us-gaap_IncomeLossFromContinuingOperations	1,206us-gaap_IncomeLossFromContinuingOperations	2,699us-gaap_IncomeLossFromContinuingOperations	2,930us-gaap_IncomeLossFromContinuingOperations	2,029us-gaap_IncomeLossFromContinuingOperations	9,711us-gaap_IncomeLossFromContinuingOperations	8,864us-gaap_IncomeLossFromContinuingOperations	16,919us-gaap_IncomeLossFromContinuingOperations
Loss from discontinued operations						(64)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity		(71)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity		(135)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	(222)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income	$ 4,691us-gaap_NetIncomeLoss	$ 3,591us-gaap_NetIncomeLoss	$ 3,475us-gaap_NetIncomeLoss	$ (2,046)us-gaap_NetIncomeLoss	$ 1,206us-gaap_NetIncomeLoss	$ 2,635us-gaap_NetIncomeLoss	$ 2,930us-gaap_NetIncomeLoss	$ 1,958us-gaap_NetIncomeLoss	$ 9,711us-gaap_NetIncomeLoss	$ 8,729us-gaap_NetIncomeLoss	$ 16,697us-gaap_NetIncomeLoss
Basic net income per common share:
Income per common share from continuing operations	$ 0.17us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.13us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.12us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ (0.07)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.04us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.09us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.10us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.06us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.34us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.29us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.54us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Loss per common share from discontinued operations											$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income per common share	$ 0.17us-gaap_EarningsPerShareBasic	$ 0.13us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic	$ (0.07)us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.10us-gaap_EarningsPerShareBasic	$ 0.06us-gaap_EarningsPerShareBasic	$ 0.34us-gaap_EarningsPerShareBasic	$ 0.29us-gaap_EarningsPerShareBasic	$ 0.53us-gaap_EarningsPerShareBasic
Diluted net income per common share:
Income per common share from continuing operations	$ 0.16us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.12us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.12us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ (0.07)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.04us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.08us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.09us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.07us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.33us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.28us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.51us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Loss per common share from discontinued operations								$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare		$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income per common share	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted	$ (0.07)us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted	$ 0.08us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.06us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ 0.27us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding:
Basic									28,718,263us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	30,283,298us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	31,703,544us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted									29,881,002us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	32,115,665us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	33,510,712us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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