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Activity related to loans receivable for the nine months ended September 30, 2021 is summarized as follows: (Details)
9 Months Ended
Sep. 30, 2021
USD ($)
Financing Receivable, Impaired [Line Items]  
 Balance at January 1, 2021 $ 750,000
 Balance at September 30, 2021 5,877,000
Commercial Portfolio Segment [Member]  
Financing Receivable, Impaired [Line Items]  
 Balance at January 1, 2021 750,000
 Investment in convertible promissory notes 4,923,000
 Accretion of discount 366,000
 Foreign currency loss (8,000)
 Conversion to marketable securities (154,000)
 Balance at September 30, 2021 $ 5,877,000