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Equity Compensation Plans - Options (Details) - USD ($)
12 Months Ended
Dec. 31, 2009
Dec. 31, 2019
Dec. 31, 2018
May 31, 2019
2019 Plan        
Equity Compensation Plans        
Number of shares authorized       600,000
2009 Plan        
Equity Compensation Plans        
Granted (in shares) 16,500      
Exercised (in shares)   4,500 0  
Shares        
Exercised (in shares)   (4,500) 0  
Employee and Nonemployee Stock Options [Member]        
Equity Compensation Plans        
Exercised (in shares)   4,500    
Total unrecognized compensation cost   $ 0    
Shares        
Beginning outstanding (in shares)   4,500    
Exercised (in shares)   (4,500)    
Ending outstanding (in shares)     4,500  
Weighted Average Exercise Price        
Beginning outstanding (in dollars per share)   $ 7.49    
Exercised (in dollars per share)   $ 7.49    
Ending outstanding (in dollars per share)     $ 7.49  
Weighted Average Remaining Contractual Term (years)        
Ending outstanding (in years)     1 month 6 days  
Aggregate Intrinsic Value        
Exercised (in dollars)   $ (27,000) $ (27,000)  
Ending outstanding (in dollars)     $ 25,000  
Restricted Stock and Restricted Stock Units [Member]        
Equity Compensation Plans        
Vesting period   3 years