TRADE RECEIVABLES (Narrative) (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Accounts Receivable, Net, Current [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 192,000	$ 952,000	$ 1,251,000
Contract with Customer, Refund Liability, Current	$ 1,198,000	$ 1,050,000	$ 1,073,000