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Stock Based Compensation - Restricted stock (Details) - Restricted Stock - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 01, 2019
Jul. 02, 2018
Mar. 15, 2018
Jul. 03, 2017
May 17, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Units                
Unvested restricted stock units outstanding           5,708    
Weighted Average Grant Date Fair Value                
Fair values of vested restricted stock and stock options           $ 0.1 $ 0.1 $ 0.1
Directors                
Number of Units                
Number of restricted stock awards granted 5,708 2,778   5,334 8,919 5,708 2,778 5,334
Number of units, vested           2,778 5,334 2,229
Weighted Average Grant Date Fair Value                
Weighted average grant date fair value, granted (in dollars per share)           $ 17.52 $ 18.00 $ 18.75
Officers                
Number of Units                
Number of restricted stock awards granted             9,956  
Number of units, vested             9,956  
Issuance of common stock for officer compensation, net of tax withholding (in shares)     9,956          
Weighted Average Grant Date Fair Value                
Weighted average grant date fair value, granted (in dollars per share)             $ 19.32  
Fair values of vested restricted stock and stock options             $ 0.2