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Investment in Leasing Operations: Credit Losses (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Dec. 29, 2018
Activity in the allowance for credit losses for leasing operations          
Balance at beginning of period     $ 861,200 $ 711,200  
Provision for credit losses $ 69,300 $ 109,000 79,400 204,000  
Recoveries     10,600 (60,900)  
Deductions for amounts written-off     (224,100) (98,400)  
Balance at end of period 727,100 $ 755,900 727,100 $ 755,900  
Investment In Leases          
Total investment in direct financing and sales-type leases 33,604,600   33,604,600    
Total investment in direct financing and sales-type leases         $ 39,800,200
Allowance for Credit Losses          
Total 727,100   727,100    
Total         861,200
Investment in leases          
Investment In Leases          
Collectively evaluated for loss potential 33,604,600   33,604,600   39,800,200
Total investment in direct financing and sales-type leases 33,604,600   33,604,600    
Total investment in direct financing and sales-type leases         39,800,200
Allowance for Credit Losses          
Collectively evaluated for loss potential 727,100   727,100   861,200
Total $ 727,100   $ 727,100    
Total         $ 861,200