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Investment in Leasing Operations: Credit Losses (Details) - USD ($)
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Activity in the allowance for credit losses for leasing operations      
Balance at beginning of period $ 896,000 $ 859,100 $ 386,000
Provision for credit losses 9,000 18,500 (149,700)
Recoveries 8,600 47,700 632,200
Deductions for amounts written-off (202,400) (29,300) (9,400)
Balance at end of period 711,200 896,000 $ 859,100
Investment In Leases      
Total investment in direct financing and sales-type leases 41,974,200 42,286,700  
Allowance for Credit Losses      
Total 711,200 896,000  
Investment in leases      
Investment In Leases      
Collectively evaluated for loss potential 41,974,200 42,286,700  
Total investment in direct financing and sales-type leases 41,974,200 42,286,700  
Allowance for Credit Losses      
Collectively evaluated for loss potential 711,200 896,000  
Total $ 711,200 $ 896,000