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LEASES (Lease expense and other information related to operating leases) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lease expenses:        
Operating lease expense $ 362 $ 265 $ 706 $ 422
Short term lease expense 170 154 310 233
Total lease expense 532 419 1,016 655
Other information related to leases [Abstract]        
Operating cash flows from operating leases 402 263 786 424
Right-of-use assets obtained in exchange for new operating lease liabilities $ 440 $ 0 $ 515 $ 5,120
Weighted-average remaining lease term - operating leases (in years) 25 years 1 month 6 days 15 years 6 months 25 years 1 month 6 days 15 years 6 months
Weighted-average discount rate - operating leases 2.00% 2.40% 2.00% 2.40%