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Other current assets (Schedule of Other Current Assets) (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Other current assets    
Advances against auction contracts $ 3,107,000 $ 6,487,000
Assets held for sale 7,067,000  
Prepaid expenses and deposits 21,622,000 20,787,000
Other Current Assets $ 31,796,000 $ 27,274,000