Investment in Leasing Operations: (Details) (USD $)	Mar. 30, 2013	Dec. 29, 2012
Direct financing and sales-type leases:
Minimum lease payments receivable	$ 36,539,000	$ 33,094,100
Estimated residual value of equipment	3,775,900	2,925,900
Unearned lease income net of initial direct costs deferred	(5,588,500)	(5,155,400)
Security deposits	(3,205,900)	(2,882,400)
Equipment installed on leases not yet commenced	4,742,600	8,443,600
Total investment in direct financing and sales-type leases	36,263,100	36,425,800
Allowance for credit losses	(800,000)	(775,800)
Net investment in direct financing and sales-type leases	35,463,100	35,650,000
Operating leases:
Operating lease assets	1,367,500	1,564,300
Less accumulated depreciation and amortization	(994,000)	(1,056,000)
Net investment in operating leases	373,500	508,300
Total net investment in leasing operations	35,836,600	36,158,300
Net investment in leases - current	14,599,400	13,461,200
Net investment in leases - long-term	$ 21,237,200	$ 22,697,100