Income Taxes: Other (Details) - USD ($)	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Tax Act
Corporate income tax rate (as a percent)	21.00%	21.00%	35.00%
Reduction of income tax expense related to the decrease in the federal income tax rate			$ 1,500,000
Deferred tax assets, valuation allowance
Valuation allowance	$ 2,768,600	$ 2,620,700
Unrecognized Tax Benefits
Unrecognized tax benefits, including interest and penalties	532,500	589,000
Interest and penalties accrued related to unrecognized tax benefit	33,500	37,700
Activity related to the company's unrecognized tax benefits
Balance at the beginning of the period	551,300	551,100
Increases related to current year tax positions	131,900	135,600
Expiration of the statute of limitations for the assessment of taxes	(184,200)	(135,400)
Balance at the end of the period	$ 499,000	$ 551,300	$ 551,100
Period over which various statutes of limitations are expected to expire	12 months

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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

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

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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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