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Note 15 - Segment Information - Segment Reporting Information by Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
 [1]
Sep. 30, 2017
 [1]
Jun. 30, 2017
 [1]
Mar. 31, 2017
 [1]
Dec. 31, 2016
 [2]
Sep. 30, 2016
 [2]
Jun. 30, 2016
 [2]
Mar. 31, 2016
 [2]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net sales                      
Net sales                 $ 1,330,696 $ 1,055,116 $ 1,175,543
Depreciation and amortization                      
Depreciation and amortization                 17,478 18,485 19,036
Operating income                      
Operating income $ (1,984) $ 5,286 $ 9,633 $ 11,051 $ (2,653) $ 27 $ 8,339 $ 35 23,986 [1] 5,748 [2] (27,779)
Goodwill and intangible asset impairment (a) [3]                 (24,951)
Other loss, net                 (118) (55) (125)
Income (loss) before interest and income taxes                 23,868 5,693 (27,904)
Interest and other expense on debt                 7,518 5,273 5,690
Income (loss) before income taxes                 16,350 420 (33,594)
Carbon Flat Products [Member]                      
Net sales                      
Net sales                 869,628 670,983 765,400
Depreciation and amortization                      
Depreciation and amortization                 10,906 11,690 12,200
Operating income                      
Operating income                 17,886 (4,371) (7,217)
Specialty Metals Flat Products [Member]                      
Net sales                      
Net sales                 227,200 189,930 192,516
Depreciation and amortization                      
Depreciation and amortization                 811 797 698
Operating income                      
Operating income                 11,240 9,841 (1,074)
Goodwill and intangible asset impairment (a)                     (500)
Tubular and Pipe Products [Member]                      
Net sales                      
Net sales                 233,868 194,203 217,627
Depreciation and amortization                      
Depreciation and amortization                 5,659 5,896 6,036
Operating income                      
Operating income                 4,568 7,713 12,583
Goodwill and intangible asset impairment (a)                     (24,451)
Corporate Segment [Member]                      
Depreciation and amortization                      
Depreciation and amortization                 102 102 102
Operating income                      
Operating income                 $ (9,708) $ (7,435) $ (7,120)
[1] Operating income (loss) in 2017 includes $2,707 of LIFO expense related to the Company's tubular and pipe products segment.
[2] Operating income (loss) in 2016 includes $1,489 of LIFO income related to the Company's tubular and pipe products segment.
[3] $24,451 of the goodwill and intangible asset impairment in 2015 related to the tubular and pipe products segment, $500 related to the specialty metals flat products segment.