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ACCOUNTS RECEIVABLE (SCHEDULE OF CHANGE IN ALLOWANCE) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
ACCOUNTS RECEIVABLE AND SIGNIFICANT CLIENTS [Abstract] |  |  |  |
Balance, beginning balance | $ 5,940,000 | $ 5,795,000 | $ 5,067,000 | $ 5,452,000
Provision for credit losses | (189,000) | 44,000 | (34,000) | 563,000
Uncollectible receivables written-off recoveries | 302,000 | (806,000) | 41,000 | (939,000)
Effect of foreign currency | (7,000) | 24,000 | (16,000) | (19,000)
Acquisition credit losses |  |  | 988,000 |
Balance, ending balance | $ 6,046,000 | $ 5,057,000 | $ 6,046,000 | $ 5,057,000

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