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Stock-based Compensation - Options Outstanding and Exercisable (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Outstanding        
Number Outstanding 450,000 455,000 455,000 537,500
Weighted Average Remaining Contractual Life 5 years 7 months 24 days      
Weighted Average Exercise Price $ 1.62 $ 1.67 $ 1.67 $ 2.19
Aggregate Intrinsic Value $ 176      
Exercisable        
Number Outstanding 360,000   275,000  
Weighted Average Exercise Price $ 1.62   $ 1.70  
Aggregate Intrinsic Value $ 176      
Grant Date February 24, 2016        
Outstanding        
Number Outstanding 450,000      
Weighted Average Remaining Contractual Life 5 years 7 months 24 days      
Weighted Average Exercise Price $ 1.62      
Exercisable        
Number Outstanding 360,000      
Weighted Average Exercise Price $ 1.62