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COMMON SHARES AND TREASURY SHARES - Issued warrants (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
COMMON SHARES AND TREASURY SHARES      
Balance as of 1 January 312,871 312,871 312,900
Additions 0 0 0
Cancellations 0 0 0
Disposals 0 0 0
Balance as of 31 December 312,871 312,871 312,871
Balance as of 1 January $ 3,100 $ 3,100 $ 3,100
Additions 0 0 0
Cancellations 0 0 0
Disposals 0 0 0
Balance as of 31 December $ 3,100 $ 3,100 $ 3,100
Balance as of 1 January 0.40% 0.50% 0.50%
Additions 0.00% 0.00% 0.00%
Cancellations (0.00%) (0.00%) (0.00%)
Disposals 0.00% 0.00% 0.00%
Dilution, due to capital increases 0.00% (0.10%) 0.00%
Balance as of 31 December 0.40% 0.40% 0.50%