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Commitments and Contingencies: (Details) - USD ($)	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Employee Benefit Plan
Service period for vesting of employer contribution	5 years
Company contributions	$ 324,000	$ 343,500	$ 361,400

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- References

No definition available.

+ Details

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

The minimum period for which an individual is required to perform services in order to be fully vested for employer contribution under the defined contribution plan.

+ References

No definition available.

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