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Discounted Lease Rentals: (Details) - USD ($)
Jun. 26, 2021
Dec. 26, 2020
Discounted Lease Rentals    
Discounted lease rentals, current $ 816,200 $ 1,096,600
Discounted lease rentals $ 1,000,000.0  
Secured Debt.    
Discounted Lease Rentals    
Weighted average interest rate on a non-recourse basis (as a percent) 5.91%