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COMMITMENTS AND CONTINGENCIES (Lease Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Lease Cost          
Amortization of right-of-use assets $ 5 $ 6 $ 16 $ 16  
Interest on lease obligation 0 0 1 1  
Total finance lease cost 5 6 17 17  
Total operating lease cost 107 103 320 304  
Short-term lease cost 116 118 362 372  
Total lease cost 228 227 699 693  
Cash paid for amounts included in the measurement of lease obligation:          
Operating cash flows from operating leases 107 102 320 301  
Financing cash flows from finance leases 5 6 16 16  
Right-of-use assets obtained in exchange for new finance lease obligations 0 0 0 0  
Right-of-use assets obtained in exchange for new operating lease obligations $ 6 20 $ 6 46  
Weighted average remaining lease term for operating leases 4 years   4 years   4 years 7 months 6 days
Weighted average remaining lease term for finance leases 10 months 24 days   10 months 24 days   1 year 10 months 24 days
Weighted average discount rate for operating leases 3.30%   3.30%   3.20%
Weighted average discount rate for finance leases 4.00%   4.00%   4.00%
Boniface Engineering, Ltd.          
Lease Cost          
Total lease cost $ 59 55 $ 172 157  
Jige International S.A.          
Lease Cost          
Total lease cost $ 27 $ 28 $ 83 $ 84