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Investment in Leasing Operations: Credit Losses (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Apr. 01, 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 95,000 (1,400)  
Recoveries (25,600) 7,700  
Balance at end of period 780,600 $ 902,300  
Investment In Leases      
Total investment in direct financing and sales-type leases 42,590,000   $ 41,974,200
Allowance for Credit Losses      
Total 780,600   711,200
Investment in leases      
Investment In Leases      
Collectively evaluated for loss potential 42,590,000   41,974,200
Total investment in direct financing and sales-type leases 42,590,000   41,974,200
Allowance for Credit Losses      
Collectively evaluated for loss potential 780,600   711,200
Total $ 780,600   $ 711,200