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Equity Compensation Plans - Options (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jun. 01, 2016
May 31, 2016
May 20, 2014
Equity Compensation Plans          
Total compensation cost $ 401,000 $ 485,000      
2014 Plan          
Equity Compensation Plans          
Number of shares authorized     975,000 600,000 375,000
Stock options          
Equity Compensation Plans          
Granted (in shares) 0 0      
Term of stock options granted 10 years        
Total unrecognized compensation cost $ 0        
Shares          
Beginning outstanding (in shares) 9,000        
Ending outstanding (in shares) 9,000        
Ending outstanding (in dollars) $ 58,000.000        
Exercisable at the end of the period (in dollars) $ 58,000        
Exercisable at end of period (in shares) 9,000        
Weighted Average Exercise Price          
Beginning outstanding (in dollars per share) $ 7.49        
Ending outstanding (in dollars per share) 7.49        
Exercisable at end of period (in dollars per share) $ 7.49        
Weighted Average Remaining Contractual Term (years)          
Ending outstanding (in years) 10 months 24 days        
Exercisable at end of period 10 months 24 days