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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

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