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Note 13 - Employee and Postretirement Benefit Plans - Awarded Shares of Restricted Stock Under Stock Incentive Plan (Details) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Restricted Stock [Member] | Independent Directors Stock Incentive Plan [Member] | Director [Member] |  |
Shares awarded (in shares) | 7,620 | 9,086
Restricted Stock [Member] | Stock Incentive Plan [Member] |  |
Shares awarded (in shares) | 48,137 | 34,522
Restricted Stock [Member] | Stock Incentive Plan [Member] | Employees [Member] |  |
Shares awarded (in shares) | 26,827 | 17,147
Performance Shares [Member] | Stock Incentive Plan [Member] | Employees [Member] |  |
Shares awarded (in shares) | 13,690 | 8,289

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- Definition Number of shares issued 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Details
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- Details
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