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Note 6 - Derivative Instruments - Impact from Derivatives on Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivatives	$ (6)	$ (19)	$ (24)	$ (150)
Interest Rate Swap [Member] | ABL Credit Facility [Member]
Derivatives				(98)
Interest Rate Swap [Member] | Chicago Tube and Iron Company Acquisition [Member]
Derivatives	(6)	(19)	(24)	(52)
Metal Swaps [Member]
Derivatives	156	111	79	173
Embedded Customer Derivatives [Member]
Derivatives	$ (156)	$ (111)	$ (79)	$ (173)

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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X

- Details

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- Details

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