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Other non-current assets (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Loans receivable $ 7,889,000 $ 5,798,000
Trade and Other Receivables [Member]    
Loans receivable $ 3,982,000 $ 927,000
Financing Receivable [Member] | Minimum [Member]    
Term of financing lending arrangement 1 year  
Financing Receivable [Member] | Maximum [Member]    
Term of financing lending arrangement 4 years