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Benefit Plans (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Allocated share-based compensation expense | $ 568 | $ 527 | $ 1,830 | $ 1,600 |
Compensation cost not yet recognized | 2,500 |  | $ 2,500 |  |
Period for recognition |  |  | 1 year 8 months 12 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 | $ 568 | $ 527 | $ 1,830 | $ 1,600 |

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