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Investment in Leasing Operations: Credit Losses (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Activity in the allowance for credit losses for leasing operations      
Balance at beginning of period $ 859,100 $ 386,000 $ 822,700
Provision for credit losses 18,500 (149,700) 62,900
Recoveries 47,700 632,200 106,900
Deductions for amounts written-off (29,300) (9,400) (606,500)
Balance at end of period 896,000 859,100 $ 386,000
Investment In Leases      
Total investment in direct financing and sales-type leases 42,286,700 39,806,600  
Allowance for Credit Losses      
Total 896,000 859,100  
Investment in leases      
Investment In Leases      
Collectively evaluated for loss potential 42,286,700 39,806,600  
Total investment in direct financing and sales-type leases 42,286,700 39,806,600  
Allowance for Credit Losses      
Collectively evaluated for loss potential 896,000 859,100  
Total $ 896,000 $ 859,100