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Note 11 - Segment Information - Segment Reporting Information by Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net sales
Net sales	$ 356,195	$ 273,608	$ 691,088	$ 531,957
Depreciation and amortization
Depreciation and Amortization	4,541	4,772	9,077	9,503
Operating income
Operating Income (loss)	9,633	8,339	20,684	8,374
Other loss, net	(28)	(58)	(54)	(63)
Income before interest and income taxes	9,605	8,281	20,630	8,311
Interest and other expense on debt	1,788	1,274	3,414	2,559
Income before income taxes	7,817	7,007	17,216	5,752
Carbon Flat Products [Member]
Net sales
Net sales	237,058	173,122	453,974	334,556
Depreciation and amortization
Depreciation and Amortization	2,905	2,988	5,794	5,942
Operating income
Operating Income (loss)	7,239	5,669	14,614	3,491
Specialty Metal Flat Products [Member]
Net sales
Net sales	58,280	49,529	116,235	95,359
Depreciation and amortization
Depreciation and Amortization	198	190	424	383
Operating income
Operating Income (loss)	2,859	2,567	6,844	4,323
Tubular And Pipe Products [Member]
Net sales
Net sales	60,857	50,957	120,879	102,042
Depreciation and amortization
Depreciation and Amortization	1,412	1,568	2,808	3,127
Operating income
Operating Income (loss)	2,344	2,133	4,831	4,376
Corporate Segment [Member]
Depreciation and amortization
Depreciation and Amortization	26	26	51	51
Operating income
Operating Income (loss)	$ (2,809)	$ (2,030)	$ (5,605)	$ (3,816)

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
-Section S99
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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+ References

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-Name Accounting Standards Codification
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