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Note 14 - Benefit Plans - Fair Value of Pension Plan's Assets (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
Fair Value, Inputs, Level 1 [Member]
Fair values of the Pension Plan's assets	48,314	37,860
Fair Value, Inputs, Level 3 [Member]
Fair values of the Pension Plan's assets	9,700	8,628
Mutual Fund [Member]
Fair values of the Pension Plan's assets	48,314	37,860
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Fair values of the Pension Plan's assets	48,314	37,860
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Fair values of the Pension Plan's assets
Other Investment [Member]
Fair values of the Pension Plan's assets	9,700	8,628
Other Investment [Member] | Fair Value, Inputs, Level 1 [Member]
Fair values of the Pension Plan's assets
Other Investment [Member] | Fair Value, Inputs, Level 3 [Member]
Fair values of the Pension Plan's assets	$ 9,700	$ 8,628

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- 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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