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UNAUDITED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
 3 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Income Statement [Abstract]    
Revenues $ 67,711,690 $ 74,067,429
Cost of services 48,896,959 53,791,698
Gross profit 18,814,731 20,275,731
Selling, general and administrative expenses 16,723,344 16,203,624
Depreciation and amortization 859,674 1,414,713
Operating income 1,231,713 2,657,394
Interest expense, net 376,527 456,025
Income before income taxes 855,186 2,201,369
Income tax expense 143,389 702,509
Net income 711,797 1,498,860
Change in unrealized gains on cash flow hedges 32,215 0
Other comprehensive income 32,215 0
Net comprehensive income $ 744,012 $ 1,498,860
Net income per share:    
Basic (in dollars per share) $ 0.07 $ 0.15
Diluted (in dollars per share) $ 0.07 $ 0.14
Weighted-average shares outstanding:    
Basic (shares) 10,332,815 10,308,445
Diluted (shares) 10,394,839 10,382,999
Cash dividends declared per common share $ 0.10 $ 0.30