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Investment in Leasing Operations: Credit Losses (Details) - USD ($)
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Activity in the allowance for credit losses for leasing operations      
Balance at beginning of period $ 711,200 $ 896,000 $ 859,100
Provision for credit losses 38,600 9,000 18,500
Recoveries 213,500 8,600 47,700
Deductions for amounts written-off (102,100) (202,400) (29,300)
Balance at end of period 861,200 711,200 $ 896,000
Investment In Leases      
Total investment in direct financing and sales-type leases 39,800,200 41,974,200  
Allowance for Credit Losses      
Total 861,200 711,200  
Investment in leases      
Investment In Leases      
Collectively evaluated for loss potential 39,800,200 41,974,200  
Total investment in direct financing and sales-type leases 39,800,200 41,974,200  
Allowance for Credit Losses      
Collectively evaluated for loss potential 861,200 711,200  
Total $ 861,200 $ 711,200