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UNAUDITED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Revenues $ 73,857,890 $ 70,945,438 $ 142,633,957 $ 137,800,908
Gross profit 20,862,834 19,192,279 39,301,475 36,502,210
Selling, general and administrative expenses 14,237,839 12,528,731 27,858,262 24,507,852
Gain on contingent consideration 0 (1,172,004) 0 (1,172,004)
Depreciation and amortization 1,204,237 1,258,381 2,435,746 2,553,887
Operating income 5,420,758 6,577,171 9,007,467 10,612,475
Interest expense, net (496,109) (741,801) (849,346) (1,612,892)
Income (loss) before income taxes 4,924,649 5,835,370 8,158,121 8,999,583
Income tax expense 1,122,820 665,486 1,860,267 1,364,128
Net income (loss) $ 3,801,829 $ 5,169,884 $ 6,297,854 $ 7,635,455
Net income per share:        
Basic (in dollars per share) $ 0.37 $ 0.56 $ 0.62 $ 0.85
Diluted (in dollars per share) $ 0.37 $ 0.54 $ 0.61 $ 0.82
Weighted-average shares outstanding:        
Basic (shares) 10,232,588 9,235,353 10,231,025 8,998,364
Diluted (shares) 10,362,038 9,538,545 10,380,195 9,301,370
Cash dividends declared per common share $ 0.30 $ 0.30 $ 0.60 $ 0.55
Service        
Revenues $ 73,857,890 $ 70,945,438 $ 142,633,957 $ 137,800,908
Cost of services $ 52,995,056 $ 51,753,159 $ 103,332,482 $ 101,298,698