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Stock-based Compensation - Options Outstanding and Exercisable (Details) - Stock Options - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Outstanding      
Number Outstanding 455,000 537,500 537,500
Weighted Average Remaining Contractual Life 6 years 29 days    
Weighted Average Exercise Price $ 1.67 $ 2.19 $ 2.19
Exercisable      
Number Outstanding 275,000 267,500  
Weighted Average Exercise Price $ 1.70 $ 2.71  
Grant Date January 21, 2010      
Outstanding      
Number Outstanding 5,000    
Weighted Average Remaining Contractual Life 18 days    
Weighted Average Exercise Price $ 6.00    
Exercisable      
Number Outstanding 5,000    
Weighted Average Exercise Price $ 6.00    
Grant Date February 24, 2016      
Outstanding      
Number Outstanding 450,000    
Weighted Average Remaining Contractual Life 6 years 1 month 24 days    
Weighted Average Exercise Price $ 1.62    
Exercisable      
Number Outstanding 270,000    
Weighted Average Exercise Price $ 1.62