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Investment in Leasing Operations: Credit Losses (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 25, 2021 | Dec. 26, 2020
Activity in the allowance for credit losses for leasing operations |  |  |
Balance at beginning of period | $ 63,600 | $ 270,200 | $ 580,600
Provisions charged to expense | (57,900) | (206,600) | (79,300)
Recoveries | 1,400 |  | (11,800)
Deductions for amounts written-off |  |  | (219,300)
Balance at end of period | 7,100 | 63,600 | $ 270,200
Investment In Leases |  |  |
Total investment in direct financing and sales-type leases | 348,700 | 3,163,000 |
Allowance for Credit Losses |  |  |
Total | 7,100 | 63,600 |
Investment in leases |  |  |
Investment In Leases |  |  |
Collectively evaluated for loss potential | 348,700 | 3,163,000 |
Total investment in direct financing and sales-type leases | 348,700 | 3,163,000 |
Allowance for Credit Losses |  |  |
Collectively evaluated for loss potential | 7,100 | 63,600 |
Total | $ 7,100 | $ 63,600 |

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
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