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Income Taxes: Other (Details) - USD ($) | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Dec. 26, 2015
Tax Act |  |  |  |
Corporate income tax rate (as a percent) |  | 35.00% | 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 | $ 599,400 | $ 26,300
Unrecognized Tax Benefits |  |  |  |
Unrecognized tax benefits, including interest and penalties |  | 583,100 | 502,000 |
Interest and penalties accrued related to unrecognized tax benefit |  | 32,000 | 22,500 |
Activity related to the company's unrecognized tax benefits |  |  |  |
Balance at the beginning of the period | $ 551,100 | 479,500 | 469,900 |
Increases related to current year tax positions |  | 192,900 | 128,500 |
Subtractions for tax positions of prior years |  | (8,300) | (5,300) |
Expiration of the statute of limitations for the assessment of taxes |  | (113,000) | (113,600) |
Balance at the end of the period |  | $ 551,100 | $ 479,500 | $ 469,900
Period over which various statutes of limitations are expected to expire |  | 12 months |  |
Scenario, Forecast |  |  |  |
Tax Act |  |  |  |
Corporate income tax rate (as a percent) | 21.00% |  |  |

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