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Commercial Loans Receivables and Allowance for Loan Loss (Finance Receivables by Evaluation Methodology) (Details) - USD ($)
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Allowance for loan losses and commercial loans receivables by class individually and collectively evaluated for impairment            
Allowance for loan loss $ (135,000) $ (113,000) $ (42,000) $ (242,000) $ (222,000) $ (210,000)
Direct Commercial Loans [Member]            
Allowance for loan losses and commercial loans receivables by class individually and collectively evaluated for impairment            
Financing Receivable, Collectively Evaluated for Impairment 13,415,000   4,193,000      
Financing Receivable, Individually Evaluated for Impairment 20,191,000   12,175,000      
Financing Receivable, Gross 33,606,000   16,368,000      
Allowance for loan loss: collectively evaluated for impairment (135,000)   (42,000)      
Allowance for loan loss: individually evaluated for impairment 0   0      
Allowance for loan loss (135,000)   (42,000)      
Participation Commercial Loans [Member]            
Allowance for loan losses and commercial loans receivables by class individually and collectively evaluated for impairment            
Financing Receivable, Collectively Evaluated for Impairment 0   0      
Financing Receivable, Individually Evaluated for Impairment 513,000   275,000      
Financing Receivable, Gross 513,000   275,000      
Allowance for loan loss: collectively evaluated for impairment 0   0      
Allowance for loan loss: individually evaluated for impairment 0   0      
Allowance for loan loss $ 0   $ 0