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Commitments and Contingencies: (Details) - USD ($)	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Employee Benefit Plan
Service period for vesting of employer contribution	5 years
Company contributions	$ 343,500	$ 361,400	$ 319,700

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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://fasb.org/us-gaap/role/ref/legacyRef
-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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X

- 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.

+ Details

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