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Note 16 - Employee Benefit Plans - Summary of Fair Values of Pension Plan Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair value of plan assets	$ 33,838	$ 35,126	$ 38,038
Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	18,849	19,952
Fair Value, Inputs, Level 1 [Member] | US Large Cap [Member]
Fair value of plan assets	6,105	7,065
Fair Value, Inputs, Level 1 [Member] | US Mid Cap [Member]
Fair value of plan assets	891	1,012
Fair Value, Inputs, Level 1 [Member] | US Small Cap [Member]
Fair value of plan assets	443	496
Fair Value, Inputs, Level 1 [Member] | World Equity [Member]
Fair value of plan assets	1,095	1,458
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Fair value of plan assets	223	103
Fair Value, Inputs, Level 1 [Member] | Fixed Income Securities [Member]
Fair value of plan assets	8,525	8,511
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Fair value of plan assets	1,253	1,001
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member]
Fair value of plan assets	314	306
Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	14,989	15,174
Fair Value, Inputs, Level 2 [Member] | US Large Cap [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | US Mid Cap [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | US Small Cap [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | World Equity [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | 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	14,989	15,174
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member]
Fair value of plan assets	$ 0	$ 0

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 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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