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Note 7 - Pensions and Other Postretirement Benefits - Allocation of Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Plan Fair Value Assets	$ 80,802	$ 83,318
Plan Fair Value Assets, Percentage	100.00%	100.00%
Fair Value, Inputs, Level 1 [Member]
Plan Fair Value Assets	$ 34,240	$ 42,691
Plan Fair Value Assets, Percentage	43.00%	51.00%
Fair Value, Inputs, Level 2 [Member]
Plan Fair Value Assets	$ 46,556	$ 40,597
Plan Fair Value Assets, Percentage	57.00%	49.00%
Fair Value, Inputs, Level 3 [Member]
Plan Fair Value Assets	$ 6	$ 30
Plan Fair Value Assets, Percentage
Equity Securities [Member]
Plan Fair Value Assets, Percentage
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Plan Fair Value Assets	$ 14,637	$ 19,752
Plan Fair Value Assets, Percentage	18.00%	24.00%
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Plan Fair Value Assets	$ 6	$ 30
Plan Fair Value Assets, Percentage
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Plan Fair Value Assets	$ 12,573	$ 11,805
Plan Fair Value Assets, Percentage	16.00%	14.00%
Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Plan Fair Value Assets	$ 46,556	$ 40,597
Plan Fair Value Assets, Percentage	57.00%	49.00%
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Plan Fair Value Assets	$ 857
Plan Fair Value Assets, Percentage	1.00%
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Plan Fair Value Assets	$ 6,173	$ 11,134
Plan Fair Value Assets, Percentage	8.00%	13.00%
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Plan Fair Value Assets
Plan Fair Value Assets, Percentage

X

- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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