Quarterly report pursuant to Section 13 or 15(d)

Our Portfolio - Receivables and Investments, Additional Information (Details)

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Our Portfolio - Receivables and Investments, Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Financing receivables on non accrual status   $ 0 $ 0
Provision for credit losses   0 0
Loan modifications that qualify as troubled debt restructurings   0 $ 0
Land [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Proceeds from lease payments $ 1,600,000    
American Wind Capital Company, LLC [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Commercial receivables, carrying value that became past due   $ 8,000,000