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SIGNIFICANT ACCOUNTING POLICIES - credit risk in the event of non-payment by customers (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
SIGNIFICANT ACCOUNTING POLICIES        
Balance at beginning of period $ 191,000 $ 273,000 $ 169,000 $ 163,000
Additions   10,000 28,000 120,000
Deduction 35,000 69,000 (41,000) (69,000)
Balance at end of period $ 156,000 $ 214,000 $ 156,000 $ 214,000