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SELECTED QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
SELECTED QUARTERLY FINANCIAL INFORMATION (UNAUDITED) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 54,143,638 | $ 56,007,937 | $ 58,044,743 | $ 36,043,295 | $ 34,144,942 | $ 33,478,347 | $ 36,883,312 | $ 33,101,657 | $ 204,239,613 | $ 137,608,258 | $ 144,567,951
Gross margin | 13,842,715 | 11,949,531 | 15,513,994 | 8,744,579 | 10,862,980 | 9,372,742 | 9,202,180 | 6,908,308 | 50,050,819 | 36,346,210 | 34,249,631
Engineering expenses | 1,460,670 | 1,848,861 | 1,682,887 | 630,411 | 577,056 | 663,704 | 733,009 | 594,538 | 5,622,829 | 2,568,307 | 2,459,062
Selling and administrative expenses | 8,402,069 | 6,527,029 | 11,344,223 | 5,877,968 | 6,480,898 | 5,444,924 | 5,363,303 | 5,352,906 | 32,151,289 | 22,642,031 | 23,762,841
Net (loss)/income | $ (168,769) | $ 2,230,481 | $ 1,466,402 | $ 1,517,141 | $ 2,649,349 | $ 2,400,064 | $ 2,087,837 | $ 648,073 | $ 5,045,255 | $ 7,785,323 | $ 5,727,043
Net (loss)/income per share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.03) | $ 0.36 | $ 0.23 | $ 0.24 | $ 0.42 | $ 0.38 | $ 0.33 | $ 0.10 | $ 0.81 | $ 1.25 | $ 0.92
Diluted (in dollars per share) | $ (0.03) | $ 0.35 | $ 0.23 | $ 0.24 | $ 0.42 | $ 0.38 | $ 0.33 | $ 0.10 | $ 0.80 | $ 1.25 | $ 0.92
Weighted average shares outstanding [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 6,261,737 | 6,259,872 | 6,258,467 | 6,256,496 | 6,254,605 | 6,252,681 | 6,250,610 | 6,248,222 | 6,259,139 | 6,251,535 | 6,245,057
Diluted (in shares) | 6,297,371 | 6,296,551 | 6,285,339 | 6,256,496 | 6,254,605 | 6,252,681 | 6,250,610 | 6,248,222 | 6,294,773 | 6,251,535 | 6,245,057

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