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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
	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

X

- 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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