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Investment in Leasing Operations: (Details 3) - USD ($)
Jun. 27, 2015
Dec. 27, 2014
Direct Financing and Sales-Type Leases, Minimum Lease Payments Receivable    
2015 $ 12,289,800  
2016 17,926,500  
2017 8,765,100  
2018 929,300  
2019 2,100  
Total 39,912,800 $ 40,739,900
Direct Financing and Sales-Type Leases, Income Amortization    
2015 2,310,300  
2016 2,419,800  
2017 610,700  
2018 16,300  
Total 5,357,100  
Operating Leases, Minimum Lease Payments Receivable    
2015 18,900  
Total $ 18,900