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Investment in Leasing Operations: Credit Losses (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021	Dec. 25, 2021
Activity in the allowance for credit losses for leasing operations
Balance at beginning of period			$ 63,600	$ 270,200
Provisions charged to expense	$ (15,700)	$ (62,700)	(24,600)	(111,400)
Recoveries			1,400
Balance at end of period	40,400	$ 158,800	40,400	$ 158,800
Investment In Leases
Total investment in direct financing and sales-type leases	1,822,900		1,822,900		$ 3,163,000
Allowance for Credit Losses
Total	40,400		40,400		63,600
Investment in leases
Investment In Leases
Collectively evaluated for loss potential	1,822,900		1,822,900		3,163,000
Total investment in direct financing and sales-type leases	1,822,900		1,822,900		3,163,000
Allowance for Credit Losses
Collectively evaluated for loss potential	40,400		40,400		63,600
Total	$ 40,400		$ 40,400		$ 63,600

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount, before allowance for credit loss, of net investment in sales-type and direct financing leases.

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