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Investment in Leasing Operations: (Details) (USD $)
Dec. 29, 2012
Dec. 31, 2011
Direct financing and sales-type leases:    
Minimum lease payments receivable $ 33,094,100 $ 27,413,300
Estimated residual value of equipment 2,925,900 2,764,400
Unearned lease income net of initial direct costs deferred (5,155,400) (4,217,000)
Security deposits (2,882,400) (2,448,800)
Equipment installed on leases not yet commenced 8,443,600 6,489,200
Total investment in direct financing and sales-type leases 36,425,800 30,001,100
Allowance for credit losses (775,800) (803,800)
Net investment in direct financing and sales-type leases 35,650,000 29,197,300
Operating leases:    
Operating lease assets 1,564,300 1,218,900
Less accumulated depreciation and amortization (1,056,000) (567,300)
Net investment in operating leases 508,300 651,600
Total net investment in leasing operations 36,158,300 29,848,900
Net investment in leases - current 13,461,200 11,746,900
Net investment in leases - long-term $ 22,697,100 $ 18,102,000