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Discounted Lease Rentals: (Details) - USD ($)
Mar. 31, 2018
Dec. 30, 2017
Discounted Lease Rentals    
Discounted lease rentals, current $ 1,612,100 $ 570,800
Discounted lease rentals $ 4,300,000  
Secured Debt    
Discounted Lease Rentals    
Weighted average interest rate on a non-recourse basis (as a percent) 6.19%