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Investment in Leasing Operations: Credit Losses (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Dec. 30, 2017
Activity in the allowance for credit losses for leasing operations          
Balance at beginning of period     $ 711,200 $ 896,000  
Provision for credit losses $ (55,600) $ (13,300) 148,400 (26,200)  
Recoveries     210,700 13,800  
Deductions for amounts written-off     (101,100)    
Balance at end of period 969,200 $ 883,600 969,200 $ 883,600  
Investment In Leases          
Total investment in direct financing and sales-type leases 45,450,000   45,450,000   $ 41,974,200
Allowance for Credit Losses          
Total 969,200   969,200   711,200
Investment in leases          
Investment In Leases          
Collectively evaluated for loss potential 45,450,000   45,450,000   41,974,200
Total investment in direct financing and sales-type leases 45,450,000   45,450,000   41,974,200
Allowance for Credit Losses          
Collectively evaluated for loss potential 969,200   969,200   711,200
Total $ 969,200   $ 969,200   $ 711,200