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Investments: (Tables)

9 Months Ended

Sep. 24, 2016

Investments:

Summary of marketable securities classified as available-for-sale securities

		September 24, 2016						December 26, 2015
		Cost			Fair Value			Cost			Fair Value
Equity securities		$	215,800		$	204,100		$	280,600		$	227,800

Schedule of the Company's unrealized gains and losses for marketable securities classified as available-for-sale securities in accumulated other comprehensive loss

		September 24, 2016			December 26, 2015
Unrealized gains		$	—		$	—
Unrealized losses			(11,700)			(52,800)
Net unrealized losses		$	(11,700)		$	(52,800)

Schedule of the Company's realized gains and losses recognized on sales of available-for-sale marketable securities

		Three Months Ended						Nine Months Ended
		September 24, 2016			September 26, 2015			September 24, 2016			September 26, 2015
Realized gains		$	—		$	—		$	—		$	13,400
Realized losses			—			—			(12,600)			(36,200)
Net realized losses		$	—		$	—		$	(12,600)		$	(22,800)

X

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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- Definition

Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales.

+ References

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