ACCOUNTING POLICIES, Revenue Recognition (Details)	12 Months Ended
Dec. 29, 2018 USD ($) Customer	Dec. 30, 2017 USD ($) Customer
Revenue Recognition [Abstract]
Accounts receivable, customers due period	30 days
Accounts receivable, allowance for doubtful accounts	$ 680,000	$ 470,000
Bad debt expense	220,000	87,000
Sales returns	725,000	565,000
Revenue [Abstract]
Net sales	$ 234,275,463	$ 204,239,613
Net Sales [Member] \| Customer Concentration Risk [Member]
Revenue [Abstract]
Number of major customers \| Customer	0	0
Threshold percentage of concentration risk	10.00%	10.00%
Subscription [Member]
Revenue [Abstract]
Net sales	$ 448,000	$ 317,000
Subscription services revenue related to performance obligations satisfied in prior periods	0	$ 0
Remaining performance obligations, revenue recognized	$ 100,000

Amount has been fully or partially written-off as bad debts.

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Number of customers that exceed the threshold percentage of concentration risk.

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No definition available.

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- Definition

The aggregate recognized during the period for goods returned by customers.

+ References

No definition available.

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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- Definition

Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Threshold period past due for trade accounts receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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