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ACCOUNTING POLICIES, Revenue Recognition (Details) - USD ($) | 12 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018
Revenue Recognition [Abstract] |  |
Accounts receivable, customers due period | 30 days |
Accounts receivable, allowance for doubtful accounts | $ 556,000 | $ 680,000
Bad debt expense | 64,000 | 220,000
Revenue recognized employing the percentage of completion method | 576,000 | 0
Sales returns | 613,000 | 725,000
Revenue [Abstract] |  |
Net sales | 251,742,619 | 234,275,463
Subscription [Member] |  |
Revenue [Abstract] |  |
Net sales | 567,000 | 448,000
Subscription services revenue related to performance obligations satisfied in prior periods | $ 0 | $ 0

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