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Income Taxes: Other (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 25, 2021
Deferred tax assets, valuation allowance    
Valuation allowance $ 901,600 $ 908,200
Unrecognized Tax Benefits    
Unrecognized tax benefits, including interest and penalties 1,050,300 821,700
Interest and penalties accrued related to unrecognized tax benefit 179,000 144,500
Activity related to the company's unrecognized tax benefits    
Balance at the beginning of the period 677,200 510,100
Increases related to current year tax positions 266,800 190,000
Subtractions for tax positions of prior years (72,700)  
Expiration of the statute of limitations for the assessment of taxes   (22,900)
Balance at the end of the period $ 871,300 $ 677,200
Period over which various statutes of limitations are expected to expire 12 months