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Note 16 - Retirement Plans - Fair Value of Plan Assets (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Fair Value, Inputs, Level 1 [Member]
SERP assets
Fair Value, Inputs, Level 2 [Member]
SERP assets	5,820
Fair Value, Inputs, Level 3 [Member]
SERP assets
Money Market Funds [Member] | Supplemental Employee Retirement Plan [Member] | Fair Value, Inputs, Level 1 [Member]
SERP assets
Money Market Funds [Member] | Supplemental Employee Retirement Plan [Member] | Fair Value, Inputs, Level 2 [Member]
SERP assets	2,403
Money Market Funds [Member] | Supplemental Employee Retirement Plan [Member] | Fair Value, Inputs, Level 3 [Member]
SERP assets
Fixed Income Funds [Member] | Supplemental Employee Retirement Plan [Member] | Fair Value, Inputs, Level 1 [Member]
SERP assets
Fixed Income Funds [Member] | Supplemental Employee Retirement Plan [Member] | Fair Value, Inputs, Level 2 [Member]
SERP assets	120
Fixed Income Funds [Member] | Supplemental Employee Retirement Plan [Member] | Fair Value, Inputs, Level 3 [Member]
SERP assets
Equity Funds [Member] | Supplemental Employee Retirement Plan [Member] | Fair Value, Inputs, Level 1 [Member]
SERP assets
Equity Funds [Member] | Supplemental Employee Retirement Plan [Member] | Fair Value, Inputs, Level 2 [Member]
SERP assets	3,297
Equity Funds [Member] | Supplemental Employee Retirement Plan [Member] | Fair Value, Inputs, Level 3 [Member]
SERP assets

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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