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Note 9 - Derivative Instruments - Impact from Derivatives on Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Gain (Loss) Recognized	$ (57)		$ (88)	$ (5)
Interest Rate Swap [Member]
Net Gain (Loss) Recognized	(57)		(88)
Interest Rate Swap [Member] | Chicago Tube and Iron Company Acquisition [Member]
Net Gain (Loss) Recognized				(5)
Metal Swaps [Member]
Net Gain (Loss) Recognized	177	(221)	310	14
Embedded Customer Derivatives [Member]
Net Gain (Loss) Recognized	$ (177)	$ 221	$ (310)	$ (14)

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

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