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Operating Leases: (Details) - USD ($)
6 Months Ended
Jun. 26, 2021
Jun. 27, 2020
Operating Leases:    
Remaining lease term 8 years 6 months  
Discount rate (as a percent) 5.50%  
Rent expense $ 580,000 $ 597,400
Maturities of operating lease liabilities:    
2021 364,800  
2022 742,900  
2023 763,300  
2024 784,400  
2025 806,000  
Thereafter 3,452,600  
Total 6,914,000  
Less imputed interest (1,391,200)  
Present value of lease liabilities 5,522,800  
Operating lease liability    
Operating lease liability, current $ 500,000  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued Liabilities, Current  
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flow outflow from operating leases $ 358,300 $ 348,600