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Stock Option Plans - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Apr. 24, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Deferred compensation (in shares) |  | 112,491 |  |  |  |  | 4,920
Shares due to exercise of employee stock options and issuance of directors' deferred stock (in shares) |  |  | 11,745 | 11,745 | 48,772 | 485 |
Stock option expense |  |  |  |  |  |  | $ 700,700
Future expense |  |  | $ 2,200,000 |  |  |  | $ 2,200,000
Closing share price (in usd per share) |  |  | $ 32.27 |  |  |  | $ 32.27
Granted (in shares) |  |  |  |  |  |  | 238,000
Weighted average remaining contractual life of the Company's outstanding options |  |  |  |  |  |  | 6 years 3 months 18 days
Weighted average remaining contractual life of the Company's exercisable options |  |  |  |  |  |  | 4 years 3 months 18 days
Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares due to exercise of employee stock options and issuance of directors' deferred stock (in shares) |  |  |  |  |  |  | 6,837
Directors and Certain Officers |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted (in shares) | 238,000 |  |  |  |  |  |
Employee Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  | 10 years
Employee Stock Option | Officers |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  | 4 years
Additional Compensation Plan | Directors |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized for annual award (in shares) | 200 |  |  |  |  |  |

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