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Income Taxes: Other (Details) - USD ($) | 12 Months Ended
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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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