Investment in Leasing Operations: (Details) - USD ($)	Sep. 26, 2015	Dec. 27, 2014
Direct financing and sales-type leases:
Minimum lease payments receivable	$ 36,246,600	$ 40,739,900
Estimated residual value of equipment	4,811,200	4,347,100
Unearned lease income net of initial direct costs deferred	(4,983,200)	(6,061,100)
Security deposits	(3,274,900)	(3,253,200)
Equipment installed on leases not yet commenced	8,326,000	8,364,100
Total	41,125,700	44,136,800
Allowance for credit losses	(882,000)	(386,000)
Net investment in direct financing and sales-type leases	40,243,700	43,750,800
Operating leases:
Operating lease assets	1,362,100	806,100
Less accumulated depreciation and amortization	(1,350,400)	(536,400)
Net investment in operating leases	11,700	269,700
Total net investment in leasing operations	40,255,400	44,020,500
Net investment in leases - current	18,260,700	19,831,600
Net investment in leases - long-term	$ 21,994,700	$ 24,188,900