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Stockholders' Equity - Issuance of Common Stock (Details)
$ in Thousands
12 Months Ended
Jul. 01, 2019
director
shares
Jul. 02, 2018
director
shares
Mar. 15, 2018
employee
shares
Jul. 03, 2017
director
shares
May 17, 2016
director
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
employee
shares
Dec. 31, 2017
USD ($)
shares
May 20, 2019
USD ($)
May 23, 2018
USD ($)
May 25, 2017
USD ($)
Share-based compensation                      
Stock compensation expense           $ 77 $ 71 $ 76      
Date of issue | Restricted Stock                      
Share-based compensation                      
Vesting percentage         25.00%            
August 17, 2016 | Restricted Stock                      
Share-based compensation                      
Vesting percentage         25.00%            
November 17, 2016 | Restricted Stock                      
Share-based compensation                      
Vesting percentage         25.00%            
February 17, 2017 | Restricted Stock                      
Share-based compensation                      
Vesting percentage         25.00%            
Directors | Restricted Stock                      
Share-based compensation                      
Fair value of equity grant award approved for each director                 $ 50 $ 50 $ 50
Number of restricted stock awards granted | shares 5,708 2,778   5,334 8,919 5,708 2,778 5,334      
Number of directors granted restricted stock awards | director 2 1   2 3            
Number of directors who elected to receive cash in lieu of the stock | director 2 3   4              
Stock compensation expense           $ 100 $ 100 $ 100      
Officers | Restricted Stock                      
Share-based compensation                      
Number of restricted stock awards granted | shares             9,956        
Issuance of common stock for officer compensation, net of tax withholding (in shares) | shares     9,956                
Number of directors granted restricted stock awards | employee     4                
Percentage of total discretionary cash incentive award elected to be received in shares of Company stock               50.00%      
Number of grantees who elected to receive a portion of total discretionary cash incentive award in shares of company stock | employee             4        
Stock compensation expense             $ 200