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Investment in Leasing Operations: (Details) - USD ($)
Jun. 27, 2015
Dec. 27, 2014
Direct financing and sales-type leases:    
Minimum lease payments receivable $ 39,912,800 $ 40,739,900
Estimated residual value of equipment 4,475,300 4,347,100
Unearned lease income net of initial direct costs deferred (5,357,100) (6,061,100)
Security deposits (3,298,000) (3,253,200)
Equipment installed on leases not yet commenced 3,685,500 8,364,100
Total 39,418,500 44,136,800
Allowance for credit losses (844,800) (386,000)
Net investment in direct financing and sales-type leases 38,573,700 43,750,800
Operating leases:    
Operating lease assets 1,204,700 806,100
Less accumulated depreciation and amortization (1,067,900) (536,400)
Net investment in operating leases 136,800 269,700
Total net investment in leasing operations 38,710,500 44,020,500
Net investment in leases - current 18,727,000 19,831,600
Net investment in leases - long-term $ 19,983,500 $ 24,188,900