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Fair Value Measurements (Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Value, Cash and restricted cash $ 17,976,000 $ 26,045,000 $ 22,521,000 $ 9,928,000  
Carrying Value, Certificates of deposit 1,757,000 0      
Carrying Value, Loans, net 119,833,000 128,843,000      
Carrying Value, Investment in joint venture 889,000 891,000     $ 900,000
Carrying Value, Term-debt 52,544,000 71,427,000      
Carrying Value, Investor notes payable 75,292,000 73,046,000      
Carrying Value [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Value, Cash and restricted cash 17,976,000 25,993,000      
Carrying Value, Certificates of deposit 1,757,000        
Carrying Value, Loans, net 119,833,000 128,843,000      
Carrying Value, Investment in joint venture 889,000 891,000      
Carrying Value, Accrued interest receivable 835,000 635,000      
Carrying Value, Term-debt 52,544,000 71,427,000      
Carrying Value, Investor notes payable 75,292,000 73,046,000      
Carrying Value, Other financial liabilities 514,000 503,000      
Fair Value [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair Value, Cash and restricted cash 17,976,000 25,993,000      
Fair Value, Certificates of deposit 1,757,000        
Fair Value, Loans, net 118,966,000 126,438,000      
Fair Value, Investment in joint venture 889,000 891,000      
Fair Value, Accrued interest receivable 835,000 635,000      
Fair Value, Term-debt 44,481,000 55,072,000      
Fair Value, Investor notes payable 77,293,000 74,592,000      
Fair Value, Other financial liabilities 514,000 503,000      
Quoted Prices In Active Markets For Identical Assets Level 1 [Member] | Fair Value [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair Value, Cash and restricted cash 17,976,000 25,993,000      
Significant Other Observable Inputs Level 2 [Member] | Fair Value [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair Value, Certificates of deposit 1,757,000        
Significant Unobservable Inputs Level 3 [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Value, Investment in joint venture 889,000 891,000      
Fair Value, Loans, net 5,815,000 8,640,000      
Significant Unobservable Inputs Level 3 [Member] | Fair Value [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Fair Value, Loans, net 118,966,000 126,438,000      
Fair Value, Investment in joint venture 889,000 891,000      
Fair Value, Accrued interest receivable 835,000 635,000      
Fair Value, Term-debt 44,481,000 55,072,000      
Fair Value, Investor notes payable 77,293,000 74,592,000      
Fair Value, Other financial liabilities $ 514,000 $ 503,000