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Pension and Equity Incentive Plans (Narrative) (Details) - USD ($) |  |  | 3 Months Ended
--- | --- | --- | ---
Jun. 14, 2019 | Dec. 14, 2018 | Mar. 31, 2020 | Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Options granted |  |  |  |
Shares underlying unexercised options |  |  | 684,675 |
Expected future expenses relating to non-vested restricted shares |  |  | $ 604,000 | $ 624,000
Expected future compensation expense, unexercised options |  |  | $ 1,300,000 |
Expected future compensation expense, weighted average period for recognition |  |  | 4 years 8 months 5 days |
Exercisable - Number of Options |  |  | 515,800 | 268,633
Restricted Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected future compensation expense, weighted average period for recognition |  |  | 1 year 18 days | 1 year 8 months 16 days
2018 Equity Incentive Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Shares authorized for issuance |  |  | 1,000,000 |
2011 Stock Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Shares authorized for issuance |  |  | 900,000 |
Supplemental Executive Retirement Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic pension cost |  |  | $ 1,800 | $ 3,000
Normal retirement age |  |  | 65 years |
Retirement benefit as percentage of compensation |  |  | 75.00% |
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic pension cost |  |  | $ 45,000 | $ 40,000
Directors [Member] | 2018 Equity Incentive Plan [Member] | Options [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Options granted | 68,750 | 300,000 |  |
Vesting period | 2 years | 2 years |  |
Directors [Member] | 2018 Equity Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Restricted stock issued | 33,110 | 54,000 |  |
Vesting period | 2 years | 2 years |  |
Directors [Member] | Tranche 1 And 2 [Member] | 2018 Equity Incentive Plan [Member] | Options [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Vesting percentage | 50.00% | 50.00% |  |
Executive Officers [Member] | 2018 Equity Incentive Plan [Member] | Options [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Options granted | 30,125 |  |  |
Vesting period | 2 years |  |  |
Executive Officers [Member] | 2018 Equity Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Restricted stock issued | 14,508 | 13,321 |  |
Vesting period | 2 years | 2 years |  |

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