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Note 7 - Derivative Instruments - Impact from Derivatives on Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivatives	$ (31)	$ (164)	$ (2,842)
Interest Rate Swap [Member] | ABL Credit Facility [Member]
Derivatives		(98)	(365)
Interest Rate Swap [Member] | Chicago Tube and Iron Company Acquisition [Member]
Derivatives	(31)	(66)	(77)
Cash Flow Metals Hedges [Member]
Derivatives			(2,400)
Metal Swaps [Member]
Derivatives	475	68	(2,304)
Embedded Customer Derivatives [Member]
Derivatives	$ (475)	$ (68)	$ 2,304

X

- Definition

Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

+ Details

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- Details

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