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Income Taxes: Other (Details) - USD ($) | 12 Months Ended
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Dec. 26, 2020 | Dec. 28, 2019
Deferred tax assets, valuation allowance |  |
Valuation allowance | $ 2,822,600 | $ 2,768,600
Unrecognized Tax Benefits |  |
Unrecognized tax benefits, including interest and penalties | 621,100 | 532,500
Interest and penalties accrued related to unrecognized tax benefit | 111,000 | 33,500
Activity related to the company's unrecognized tax benefits |  |
Balance at the beginning of the period | 499,000 | 551,300
Increases related to current year tax positions | 144,500 | 131,900
Subtractions for tax positions of prior years | (133,400) |
Expiration of the statute of limitations for the assessment of taxes |  | (184,200)
Balance at the end of the period | $ 510,100 | $ 499,000
Period over which various statutes of limitations are expected to expire | 12 months |

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