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Other current assets (Schedule of Other Current Assets) (Details) - USD ($)
Dec. 31, 2021
Aug. 13, 2021
Dec. 31, 2020
Dec. 31, 2019
Other current assets        
Advances against auction contracts $ 4,102,000   $ 6,487,000  
Assets held for sale 17,538,000 $ 7,067,000   $ 15,051,000
Prepaid expenses and deposits 41,955,000   20,787,000  
Derivative financial asset 751,000      
Other Current Assets $ 64,346,000   $ 27,274,000