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Note 14 - Benefit Plans - Fair Value of Pension Plan's Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair values of the Pension Plan's assets	$ 46,488	$ 43,985	$ 45,452
Fair Value, Inputs, Level 1 [Member]
Fair values of the Pension Plan's assets	37,860	40,310
Fair Value, Inputs, Level 3 [Member]
Fair values of the Pension Plan's assets	8,628	3,675
Mutual Fund [Member]
Fair values of the Pension Plan's assets	37,860	40,310
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Fair values of the Pension Plan's assets	37,860	40,310
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	8,628	3,675
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	$ 8,628	$ 3,675

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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 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930

Reference 2: 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=65897934&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6520858

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- Details

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