ACCOUNTS RECEIVABLE AND ALLOWANCE FOR DOUBTFUL ACCOUNTS (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ACCOUNTS RECEIVABLE AND ALLOWANCE FOR DOUBTFUL ACCOUNTS
Accounts receivable	$ 7,817,000	$ 7,726,000
Allowance for doubtful accounts, sales discounts and chargebacks	(267,000)	(258,000)
Accounts receivable - net	$ 7,550,000	$ 7,468,000	$ 9,313,000