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Investment in Leasing Operations: Credit Losses (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 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	$ (55,500)	$ (55,600)	23,900	148,400
Recoveries			15,700	210,700
Deductions for amounts written-off			(224,000)	(101,100)
Balance at end of period	676,800	$ 969,200	676,800	$ 969,200
Investment In Leases
Total investment in direct financing and sales-type leases	30,645,100		30,645,100
Total investment in direct financing and sales-type leases					$ 39,800,200
Allowance for Credit Losses
Total	676,800		676,800
Total					861,200
Investment in leases
Investment In Leases
Collectively evaluated for loss potential	30,645,100		30,645,100		39,800,200
Total investment in direct financing and sales-type leases	30,645,100		30,645,100
Total investment in direct financing and sales-type leases					39,800,200
Allowance for Credit Losses
Collectively evaluated for loss potential	676,800		676,800		861,200
Total	$ 676,800		$ 676,800
Total					$ 861,200

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- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of direct write-downs of financing receivables charged against the allowance.

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-Publisher FASB
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-Topic 310
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The balance of financing receivables that were collectively evaluated for impairment.

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Amount of expense related to estimated loss from loan and lease transactions.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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The lessor's asset under sales type and direct financing leases. The investment in direct financing and sales-type leases, as of the balance sheet date, consisting of: (a) minimum lease payments due on direct financing leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs on direct financing leases; less: (i) estimated executory costs, (ii) unearned income, but before deducting the accumulated allowance for uncollectible minimum lease payments.

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