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Equity Compensation Plans - Options (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2009
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 31, 2016
Dec. 31, 2015
Equity Compensation Plans              
Term of stock options granted 10 years            
Vesting period 3 years            
Shares              
Exercised (in shares)     $ (33,000)   $ (11,000)    
2009 Plan              
Equity Compensation Plans              
Granted (in shares)   16,500          
Exercised (in shares)     4,500 0 1,500    
Shares              
Ending outstanding (in shares) 4,500   4,500        
Stock options              
Equity Compensation Plans              
Total unrecognized compensation cost $ 0   $ 0        
Shares              
Beginning outstanding (in shares)     9,000        
Exercised (in shares)     $ (4,500)        
Ending outstanding (in shares) 4,500   4,500 9,000      
Exercisable at end of period (in shares) 4,500   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   7.49 $ 7.49      
Exercisable at end of period (in dollars per share) $ 7.49   $ 7.49        
Weighted Average Remaining Contractual Term (years)              
Ending outstanding (in years)     1 month 6 days 1 year 1 month 6 days      
Exercisable at end of period     1 month 6 days        
Aggregate Intrinsic Value              
Exercised (in dollars)     $ (27,000)   $ (3,000)    
Ending outstanding (in dollars) $ 25,000   25,000 $ 55,000      
Exercisable at the end of the period (in dollars) $ 25,000   $ 25,000        
Stock options | 2014 Plan              
Equity Compensation Plans              
Number of shares authorized           975,000 375,000