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Debt: Notes Payable (Details) - USD ($)
 1 Months Ended 12 Months Ended
May 31, 2015
Dec. 30, 2017
Dec. 26, 2015
Jul. 31, 2017
Notes Payable        
Proceeds from the Note Agreement   $ 12,500,000 $ 25,000,000  
Notes Payable | Prudential Investment Management, Inc        
Notes Payable        
Principal amount outstanding   32,200,000    
Minimum prepayment   1,000,000    
Series A Notes | Prudential Investment Management, Inc        
Notes Payable        
Note payable, face amount $ 25,000,000      
Proceeds from the Note Agreement $ 25,000,000      
Principal amount outstanding   $ 20,000,000    
Term of notes payable   10 years    
Interest rate (as a percent)   5.50%    
Quarterly principal payment, first five years   $ 500,000    
Quarterly principal payment, thereafter   $ 750,000    
Series B Notes | Prudential Investment Management, Inc        
Notes Payable        
Note payable, face amount       $ 12,500,000
Term of notes payable   10 years    
Interest rate (as a percent)   5.10%    
Quarterly principal payment   $ 312,500