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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 29, 2019
Sep. 29, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 30, 2018
Sep. 30, 2018
Jul. 01, 2018
Apr. 01, 2018
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 72,315,285 $ 79,364,306 $ 73,857,890 $ 68,776,067 $ 71,999,881 $ 77,062,137 $ 70,945,438 $ 66,855,470 $ 294,313,548 $ 286,862,926 $ 272,600,050
Gross Profit 19,203,169 22,176,622 20,862,834 18,438,640 18,719,957 21,373,025 19,192,279 17,309,931 80,681,265 76,595,192 68,401,998
Income before income taxes 3,852,889 5,540,959 4,924,649 3,233,471 5,980,053 6,429,644 5,835,370 3,164,213 17,551,968 21,409,280 14,507,634
Net income $ 2,741,967 $ 4,207,170 $ 3,801,829 $ 2,496,024 $ 4,852,700 $ 5,061,386 $ 5,169,884 $ 2,465,571 $ 13,246,990 $ 17,549,541 $ 5,848,434
Net income per share:                      
Basic (in dollars per share) $ 0.27 $ 0.41 $ 0.37 $ 0.24 $ 0.48 $ 0.50 $ 0.56 $ 0.28 $ 1.29 $ 1.83 $ 0.67
Diluted (in dollars per share) $ 0.26 $ 0.41 $ 0.37 $ 0.24 $ 0.47 $ 0.49 $ 0.54 $ 0.27 $ 1.28 $ 1.79 $ 0.65
Weighted-average shares outstanding:                      
Basic (in shares) 10,253,085 10,239,126 10,232,588 10,229,462 10,184,652 10,109,791 9,235,353 8,761,292 10,238,565 9,577,498 8,733,941
Weighted-average number of diluted common shares outstanding (in shares) 10,370,996 10,343,673 10,362,038 10,404,355 10,365,117 10,342,559 9,538,545 9,087,016 10,350,775 9,808,080 9,038,187