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Investment in Leasing Operations: (Details 4) (USD $)	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Activity in the allowance for credit losses for leasing operations
Balance at beginning of period	$ 822,700us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 775,800us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 803,800us-gaap_FinancingReceivableAllowanceForCreditLosses
Provisions charged to expense	62,900us-gaap_ProvisionForLoanLeaseAndOtherLosses	(44,700)us-gaap_ProvisionForLoanLeaseAndOtherLosses	(47,600)us-gaap_ProvisionForLoanLeaseAndOtherLosses
Recoveries	106,900us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery	127,500us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery	251,000us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Deductions for amounts written-off	(606,500)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs	(35,900)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs	(231,400)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Balance at end of period	$ 386,000us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 822,700us-gaap_FinancingReceivableAllowanceForCreditLosses	$ 775,800us-gaap_FinancingReceivableAllowanceForCreditLosses

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

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X

- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(4)

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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X

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9



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-Name Accounting Standards Codification

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