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Investment in Leasing Operations (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Direct financing and sales-type leases:    
Minimum lease payments receivable $ 27,709,500 $ 27,413,300
Estimated residual value of equipment 2,904,200 2,764,400
Unearned lease income net of initial direct costs deferred (4,575,700) (4,217,000)
Security deposits (2,731,300) (2,448,800)
Equipment installed on leases not yet commenced 9,087,700 6,489,200
Total investment in direct financing and sales-type leases 32,394,400 30,001,100
Allowance for credit losses (785,800) (803,800)
Net investment in direct financing and sales-type leases 31,608,600 29,197,300
Operating leases:    
Operating lease assets 1,131,300 1,218,900
Less accumulated depreciation and amortization (667,400) (567,300)
Net investment in operating leases 463,900 651,600
Total net investment in leasing operations 32,072,500 29,848,900
Net investment in leases - current 11,454,500 11,746,900
Net investment in leases - long-term $ 20,618,000 $ 18,102,000