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Note 14 - Benefit Plans - Weighted-average Asset Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair values of the Pension Plan's assets	$ 58,014	$ 46,488	$ 43,985
Asset Category, Percentage	100.00%	100.00%
Fixed Income Funds [Member]
Fair values of the Pension Plan's assets	$ 10,637	$ 7,812
Asset Category, Percentage	18.00%	17.00%
Domestic Equity [Member]
Fair values of the Pension Plan's assets	$ 25,151	$ 19,615
Asset Category, Percentage	43.00%	42.00%
International Equity [Member]
Fair values of the Pension Plan's assets	$ 16,093	$ 13,466
Asset Category, Percentage	28.00%	29.00%
Real Estate [Member]
Fair values of the Pension Plan's assets	$ 6,133	$ 5,595
Asset Category, Percentage	11.00%	12.00%
Minimum [Member] | Fixed Income Funds [Member]
Asset Category, Target	15.00%
Minimum [Member] | Domestic Equity [Member]
Asset Category, Target	36.50%
Minimum [Member] | International Equity [Member]
Asset Category, Target	17.00%
Minimum [Member] | Real Estate [Member]
Asset Category, Target	7.00%
Maximum [Member] | Fixed Income Funds [Member]
Asset Category, Target	25.00%
Maximum [Member] | Domestic Equity [Member]
Asset Category, Target	61.50%
Maximum [Member] | International Equity [Member]
Asset Category, Target	25.00%
Maximum [Member] | Real Estate [Member]
Asset Category, Target	15.00%

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 target 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/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(i)
-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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