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Consolidated Statements of Income (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Revenues $ 51,710,000 $ 45,512,000 $ 102,522,000 $ 91,853,000
Cost of services 38,975,000 33,399,000 77,232,000 67,988,000
Gross profit 12,735,000 12,113,000 25,290,000 23,865,000
Operating costs and expenses        
Selling, general and administrative 10,076,000 10,075,000 20,497,000 20,392,000
Depreciation and amortization 398,000 410,000 812,000 807,000
Severance, professional fees and other charges 1,371,000 1,371,000
Change in contingent consideration 781,000 781,000
Operating costs and expenses 11,845,000 11,266,000 22,680,000 21,980,000
Operating income 890,000 847,000 2,610,000 1,885,000
Other (expense) income        
Interest expense and other, net (400,000) (134,000) (666,000) (272,000)
Gain (loss) on foreign currency transactions 12,000 53,000 (29,000) 55,000
Other (expense) income (388,000) (81,000) (695,000) (217,000)
Income before income taxes 502,000 766,000 1,915,000 1,668,000
Income tax expense 121,000 577,000 483,000 929,000
Net income $ 381,000 $ 189,000 $ 1,432,000 $ 739,000
Basic and diluted net earnings per share (in dollars per share) $ 0.03 $ 0.02 $ 0.12 $ 0.06