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Investment in Leasing Operations: (Details 3) (USD $)
Sep. 29, 2012
Dec. 31, 2011
Direct Financing and Sales-Type Leases, Minimum Lease Payments Receivable    
2012 $ 4,239,300  
2013 13,224,200  
2014 6,813,400  
2015 1,957,100  
2016 499,300  
Total 26,733,300 27,413,300
Direct Financing and Sales-Type Leases, Income Amortization    
2012 1,263,800  
2013 2,576,000  
2014 692,300  
2015 108,300  
2016 6,700  
Total 4,647,100 4,217,000
Operating Leases, Minimum Lease Payments Receivable    
2012 262,600  
2013 1,552,100  
2014 132,400  
Total $ 1,947,100