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Shareholders' Equity (Deficit): Stock Option Plans and Stock-Based Compensation (Details) - Stock options - USD ($)
 3 Months Ended 12 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Dec. 28, 2019
Number of Shares      
Outstanding at the beginning of the period (in shares) 479,558    
Granted (in shares) 0 0  
Exercised (in shares) (2,895)    
Forfeited (in shares) (23,000)    
Outstanding at the end of the period (in shares) 453,663   479,558
Exercisable at the end of the period (in shares) 341,838    
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 101.78    
Exercised (in dollars per share) 50.40    
Forfeited (in dollars per share) 148.16    
Outstanding at the end of the period (in dollars per share) 99.76   $ 101.78
Exercisable at the end of the period (in dollars per share) $ 83.42    
Weighted Average Remaining Contractual Life (years)      
Outstanding 5 years 5 months 1 day   5 years 9 months 15 days
Exercisable at the end of the period 4 years 5 months 16 days    
Intrinsic Value      
Outstanding $ 16,967,200   $ 45,283,200
Exercisable at the end of the period 16,657,100    
Additional disclosures      
Compensation expense 140,300 $ 498,800  
Total unrecognized compensation expense $ 2,900,000    
Weighted average period for recognition of unrecognized compensation expense 2 years 4 months 24 days