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Benefit Plans (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Allocated share-based compensation expense $ 517 $ 383 $ 1,073 $ 862  
Compensation cost not yet recognized 3,100   $ 3,100    
Period for recognition     1 year 10 months 24 days    
Percentage of annual retainer received in either common stock or deferred stock rights     100.00%    
Plan 2013          
Number of shares authorized (in shares)         750,000
Director          
Common stock shares reserved for future grants (in shares)     180,000    
Voting and Nonvoting Common Stock | Voting and Nonvoting Common Stock          
Allocated share-based compensation expense $ 517 $ 383 $ 1,073 $ 862