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Stock Plans (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 $ / shares item shares | Mar. 31, 2019 | Dec. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of active share-based compensation plans | item | 2 |  |
Common stock, no par value | $ / shares |  |  |
Stock-Settled Stock Appreciation Rights (SSARs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted |  |  |
Vesting period | 3 years |  |
Options exercised |  |  | 3,059
Options exercised, intrinsic value | $ |  |  | $ 10,631
Options exercised, realized tax deduction | $ |  |  | 108,134
Options exercised, tax benefit | $ |  |  | $ 22,708
Director Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized | 750,000 |  |
Common stock, no par value | $ / shares |  |  |
Director Plan [Member] | Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years | 3 years |
Omnibus Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized | 750,000 |  |
Common stock, no par value | $ / shares |  |  |
Omnibus Plan [Member] | Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Omnibus Plan [Member] | Stock-Settled Stock Appreciation Rights (SSARs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Contractual term | 10 years |  |
Long-Term Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Long-Term Incentive Plan [Member] | Senior Officers and Managers [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period |  | 1 year |
Long-Term Incentive Plan [Member] | Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Holding period | 2 years |  |
Long-Term Incentive Plan [Member] | Restricted Stock [Member] | Senior Officers and Managers [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period | 1 year |  |
Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized | 165,000 |  |
Number of shares issued | 84,904 |  |
Award Date One [Member] | Omnibus Plan [Member] | Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  | 3 years |

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