ACCOUNTING POLICIES, Revenue Recognition (Details) - USD ($)	12 Months Ended
	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