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Note 6 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Deferred compensation plan	$ 5,885	$ 6,244
Foreign currency forward contracts	19
Total assets	5,904
Foreign currency forward contracts	(16)	(60)
Fair Value, Inputs, Level 1 [Member]
Deferred compensation plan	4,901	5,251
Foreign currency forward contracts
Total assets	4,901
Foreign currency forward contracts
Fair Value, Inputs, Level 2 [Member]
Deferred compensation plan	984	993
Foreign currency forward contracts	19
Total assets	1,003
Foreign currency forward contracts	(16)	(60)
Fair Value, Inputs, Level 3 [Member]
Deferred compensation plan
Foreign currency forward contracts
Total assets
Foreign currency forward contracts

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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X

- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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