Annual report pursuant to Section 13 and 15(d)

INTANGIBLE ASSETS - Amortization expense (Details)

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INTANGIBLE ASSETS - Amortization expense (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
INTANGIBLE ASSETS      
Amortization expense $ 2,136,000 $ 2,132,000 $ 2,108,000
Estimated aggregate amount of amortization expense for intangible assets      
2023 2,100,000    
2024 2,100,000    
2025 2,100,000    
2026 2,100,000    
2027 2,100,000    
Accumulated amortization $ 7,200,000 $ 5,100,000