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Shareholders' Equity (Deficit): Stock Options (Details) - shares
12 Months Ended
Dec. 26, 2020
Apr. 29, 2020
Feb. 24, 2020
Feb. 20, 2011
2020 Plan        
Stock Option Plans        
Number of shares authorized for issuance   100,000    
2020 Plan | Stock options | Minimum        
Stock Option Plans        
Exercise price of stock options as a percentage of fair value on the date of grant 100.00%      
Threshold voting rights above which the option exercise price may not be less than 110% of the fair market value (as a percent) 10.00%      
Exercise price of stock options as a percentage of fair value on the date of grant for an individual who owns more than 10% of voting rights 110.00%      
2020 Plan | Stock options | Maximum        
Stock Option Plans        
Term of the option 10 years      
2001 Plan        
Stock Option Plans        
Number of shares authorized for issuance       750,000
2010 Plan        
Stock Option Plans        
Number of shares authorized for issuance     700,000  
Number of shares authorized and unissued under the plan   125,465    
Nonemployee Directors Plan        
Stock Option Plans        
Number of shares authorized for issuance     350,000  
Number of shares authorized and unissued under the plan   24,500