Note 5 - Derivative Instruments and Hedging Activities - Fair Value of Derivatives (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Commodity Contract [Member]
Fair Value of Derivatives	$ (200)	$ 107
Foreign Exchange Contract [Member]
Fair Value of Derivatives	(55)	167
Interest Rate Swap [Member]
Fair Value of Derivatives	$ 16,217	$ 4,356

Fair value of the assets less the liabilities of a derivative or group of derivatives.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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Period Type:	instant