Income Taxes: Other (Details) - USD ($)	12 Months Ended
Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Tax Act
Corporate income tax rate (as a percent)	21.00%	35.00%	35.00%
Reduction of income tax expense related to the decrease in the federal income tax rate		$ 1,500,000
Excess tax benefits related to stock option exercises
Excess tax benefits related to stock option exercises, credited to stockholders' equity	$ 0	0	$ 599,400
Unrecognized Tax Benefits
Unrecognized tax benefits, including interest and penalties	589,000	583,100
Interest and penalties accrued related to unrecognized tax benefit	37,700	32,000
Activity related to the company's unrecognized tax benefits
Balance at the beginning of the period	551,100	479,500
Increases related to current year tax positions	135,600	192,900
Subtractions for tax positions of prior years		(8,300)
Expiration of the statute of limitations for the assessment of taxes	(135,400)	(113,000)
Balance at the end of the period	$ 551,300	$ 551,100	$ 479,500
Period over which various statutes of limitations are expected to expire	12 months

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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Effect of Tax Cuts and Jobs Act of 2017 [Abstract]

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Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017.

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The amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns, including accruals as of the date of the statement of financial position, for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, which does not meet the minimum statutory threshold to avoid payment of penalties.

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