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Investment in Leasing Operations: Credit Losses (Details) - USD ($)
 6 Months Ended
Jun. 25, 2016
Jun. 27, 2015
Dec. 26, 2015
Investment In Leases      
Total investment in direct financing and sales-type leases $ 37,608,100   $ 39,806,600
Allowance for Credit Losses      
Collectively evaluated for loss potential 817,100   859,100
Total 817,100   859,100
Investment in leases      
Activity in the allowance for credit losses for leasing operations      
Balance at beginning of period 859,100 $ 386,000  
Provisions charged to expense (22,300) (162,200)  
Recoveries 9,600 630,300  
Deductions for amounts written-off (29,300) (9,300)  
Balance at end of period 817,100 $ 844,800  
Investment In Leases      
Collectively evaluated for loss potential 37,608,100   39,806,600
Total investment in direct financing and sales-type leases $ 37,608,100   $ 39,806,600