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Note 8 - Derivative Instruments - Impact from Derivatives on Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivatives		$ (5)	$ (5)	$ (18)
Interest Rate Swap [Member] | Chicago Tube and Iron Company Acquisition [Member]
Derivatives		(5)	(5)	(18)
Metal Swaps [Member]
Derivatives	101	(91)	207	(77)
Embedded Customer Derivatives [Member]
Derivatives	$ (101)	$ 91	$ (207)	$ 77

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

+ Details

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