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Note 16 - Employee Benefit Plans - Summary of Fair Values of Pension Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair value of plan assets	$ 34,398	$ 33,838	$ 35,126
Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	17,639	18,849
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Fair value of plan assets	1,090	1,253
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | US Large Cap [Member]
Fair value of plan assets	5,845	6,105
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | US Mid Cap [Member]
Fair value of plan assets	1,343	891
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | US Small Cap [Member]
Fair value of plan assets	795	443
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | World Equity [Member]
Fair value of plan assets	1,484	1,095
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member]
Fair value of plan assets	473	314
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member]
Fair value of plan assets	147	223
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member]
Fair value of plan assets	6,462	8,525
Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	16,759	14,989
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | US Large Cap [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | US Mid Cap [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | US Small Cap [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | World Equity [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Other Equity Securities [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Fixed Income Securities [Member]
Fair value of plan assets	$ 16,759	$ 14,989

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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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