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Stock Option Activity (Details) - $ / shares
 6 Months Ended
Jun. 30, 2016
Jun. 28, 2015
Dec. 31, 2015
Dec. 28, 2014
Number of Common Shares, Options Outstanding        
Number of Common Shares, Options Outstanding, Beginning of year 2,419,529 755,617    
Number of Common Shares, Options Outstanding, Granted 223,070      
Number of Common Shares, Options Outstanding, Exercised (294,956) (2,500)    
Number of Common Shares, Options Outstanding, Cancelled (10,000)      
Number of Common Shares, Options Outstanding, End of year 2,337,643 753,117    
Number of Common Shares, Exercisable        
Number of Common Shares Exercisable 429,573 677,870 724,529 616,792
Number of Common Shares, Available for Grant        
Number of Common Shares, Available for Grant, beginning of year 837,635 276,635    
Number of Common Shares, Available for Grant, Authorized 874,709      
Number of Common Shares, Available for Grant, Granted (223,070)      
Number of Common Shares, Available for Grant, Cancelled 10,000      
Number of Common Shares, Available for Grant, end of year 1,499,274 276,635    
Weighted Average Exercise Price        
Weighted Average Exercise Price, beginning of year $ 8.16 $ 6.09    
Weighted Average Exercise Price, Granted 11.19      
Weighted Average Exercise Price, Exercised 11.21 6.14    
Weighted Average Exercise Price, Cancelled 9.33      
Weighted Average Exercise Price, end of year $ 8.75 $ 6.09