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Note 16 - Segment Information - Segment Reporting Information by Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net sales:                      
Net sales $ 429,590 $ 456,976 $ 452,917 $ 375,598 $ 308,166 $ 331,442 $ 356,195 $ 334,893 $ 1,715,081 $ 1,330,696 $ 1,055,116
Depreciation and amortization:                      
Depreciation and amortization                 17,608 17,478 18,485
Operating income (loss):                      
Operating income $ 1,774 [1] $ 18,614 [1] $ 24,319 [1] $ 12,345 [1] $ (1,984) [2] $ 5,286 [2] $ 9,633 [2] $ 11,051 [2] 57,052 [1] 23,986 [2] 5,748
Other loss, net                 (307) (118) (55)
Income before interest and income taxes                 56,745 23,868 5,693
Interest and other expense on debt                 10,681 7,518 5,273
Income before income taxes                 46,064 16,350 420
Carbon Flat Products [Member]                      
Net sales:                      
Net sales                 1,073,292 869,628 670,983
Depreciation and amortization:                      
Depreciation and amortization                 10,621 10,906 11,690
Operating income (loss):                      
Operating income                 44,354 17,886 (4,371)
Specialty Metals Flat Products [Member]                      
Net sales:                      
Net sales                 343,479 227,200 189,930
Depreciation and amortization:                      
Depreciation and amortization                 1,251 811 797
Operating income (loss):                      
Operating income                 15,248 11,240 9,841
Tubular and Pipe Products [Member]                      
Net sales:                      
Net sales                 298,310 233,868 194,203
Depreciation and amortization:                      
Depreciation and amortization                 5,601 5,659 5,896
Operating income (loss):                      
Operating income                 11,520 4,568 7,713
Corporate Segment [Member]                      
Depreciation and amortization:                      
Depreciation and amortization                 135 102 102
Operating income (loss):                      
Operating income                 $ (14,070) $ (9,708) $ (7,435)
[1] Operating income (loss) in 2018 includes $8,408 of LIFO expense related to the Company's tubular and pipe products segment.
[2] Operating income (loss) in 2017 includes $2,707 of LIFO expense related to the Company's tubular and pipe products segment.