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Note 13 - Employee and Postretirement Benefit Plans - Fair Values of Pension Plan Assets (Details)	Dec. 31, 2019	Dec. 31, 2018
Fair value of plan assets	100.00%	100.00%
Cash and Cash Equivalents [Member]
Fair value of plan assets	3.00%	3.00%
Debt Securities [Member]
Fair value of plan assets	38.00%	40.00%
Equity Securities [Member]
Fair value of plan assets	49.00%	45.00%
Alternative Funds [Member]
Fair value of plan assets	10.00%	12.00%

X

- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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