ACCOUNTS RECEIVABLE (SCHEDULE OF CHANGE IN ALLOWANCE) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract]
Balance, beginning balance	$ 5,409,000	$ 5,067,000
Provision for credit losses	(185,000)	21,000
Uncollectible receivables written-off	(213,000)	(83,000)
Effect of foreign currency	21,000	(8,000)
Balance, ending balance	$ 5,032,000	$ 4,997,000