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Note 16 - Pension Plan - Assets Measured at Fair Value (Details) - Pension Plan [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair value of plan assets	$ 38,813	$ 33,016	$ 30,627
Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	36,360
Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	2,453
Equity Funds [Member]
Fair value of plan assets	3,351
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	3,351
US Government Agencies Debt Securities [Member]
Fair value of plan assets	32,906
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	32,906
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets
Cash [Member]
Fair value of plan assets	102
Cash [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	102
Other Plan Assets[Member]
Fair value of plan assets	2,453
Other Plan Assets[Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	$ 2,453

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 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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