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Note 13 - Employee and Postretirement Benefit Plans (Details Textual) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2020 shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Estimated Minimum Contribution to Defined Benefit Pension Plan |  |  | $ 0 |
Payment for Pension Benefits |  |  | $ 891,000 | $ 717,000
Employee Stock Ownership Plan (ESOP), Diversification Feature, Age Requirement |  |  | 55 |
Deferred Compensation Arrangement with Individual, Requisite Service Period |  |  | 10 years |
Employee Stock Ownership Plan (ESOP), Diversification Feature Percentage |  |  | 50.00% |
Employee Stock Ownership Plan (ESOP), Policy Diversification Feature Term |  |  | 6 years |
Employee Stock Ownership Plan (ESOP), Shares Repurchased | shares |  |  | 0 | 0
Employee Stock Ownership Plan (ESOP), Shares in ESOP, Total | shares |  |  | 473,171 | 444,843
Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP |  |  | $ 718,000 | $ 605,000
Pension and Other Postretirement Benefits Cost (Reversal of Cost), Total |  |  | $ 5,837,000 | 5,259,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  | 2 years 255 days |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  |  | $ 726,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  | 276,000 | 291,000
Share-based Payment Arrangement, Expense |  |  | 798,000 | 855,000
Forecast [Member] |  |  |  |
Share-based Payment Arrangement, Expense |  | $ 920,000 |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |
Share-based Payment Arrangement, Expense |  |  | 0 | 0
Restricted Stock [Member] |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 822,000 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  | 1 year 146 days |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares |  |  | 48,137 |
Share-based Payment Arrangement, Expense |  |  | $ 798,000 | $ 855,000
Stock Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  |  | 850,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares |  |  | 223,867 |
Stock Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 180 days |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  | 10 years |
Stock Incentive Plan [Member] | Restricted Stock [Member] | Subsequent Event [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares | 30,381 |  |  |
Stock Incentive Plan [Member] | Restricted Stock [Member] | Subsequent Event [Member] | Vesting Contingent upon Corporation Meeting ROAE Performance Ratio [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 50.00% |  |  |
Stock Incentive Plan [Member] | Restricted Stock [Member] | Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years | 3 years
Stock Incentive Plan [Member] | Performance Shares [Member] | Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years | 3 years
Independent Directors Stock Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  |  | 235,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  | 10 years |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares |  |  | 109,965 |
Independent Directors Stock Incentive Plan [Member] | Restricted Stock [Member] | Subsequent Event [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 1 year |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares | 7,580 |  |  |
Independent Directors Stock Incentive Plan [Member] | Restricted Stock [Member] | Director [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 1 year | 1 year
Pension Plan [Member] |  |  |  |
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year |  |  | $ 16,000 |
Defined Benefit Plan, Accumulated Benefit Obligation |  |  | 976,000 | $ 870,000
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year |  |  | 7,000 |
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year |  |  | 31,000 |
Supplemental Employee Retirement Plan [Member] |  |  |  |
Pension and Other Postretirement Benefits Cost (Reversal of Cost), Total |  |  | $ 251,000 | $ 242,000

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- Definition The age a participant in an Employee Stock Ownership Plan must be in order to be eligible for the plans diversification feature. + References No definition available. + Details
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- Definition The maximum amount of Corporation shares that a participant in an Employee Stock Ownership Plan is allowed to sell back in a predetermined amount of time once qualifications for the plans diversification feature have been met. + References No definition available. + Details
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- Definition The period of time that a participant in an Employee Stock Ownership Plan has to sell back Corporation shares once qualifications for the plans diversification feature have been met. + References No definition available. + Details
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition This item represents the amount of cash contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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