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Industry Segments - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 67,946 | $ 73,640 | $ 78,778 | $ 84,804 | $ 72,674 | $ 77,793 | $ 71,894 | $ 58,480 | $ 305,168 | $ 280,841 | $ 201,148
Gain on sale-leaseback |  |  |  |  |  |  |  |  | 0 | 334 | 334
Unallocated corporate expenses |  |  |  |  |  |  |  |  | 32,627 | 27,691 | 24,875
Earn-out adjustments |  |  |  |  |  |  |  |  | (747) | 1,431 | 688
Acquisition related costs |  |  |  |  |  |  |  |  | 601 | 1,212 | 795
Operating (loss) income |  |  |  |  |  |  |  |  | (1,708) | 21,237 | 2,057
Interest expense |  |  |  |  |  |  |  |  | 3,818 | 2,211 | 985
Change in fair value of interest rate swap |  |  |  |  |  |  |  |  | (141) | 20 | 96
Other income, net |  |  |  |  |  |  |  |  | 1,904 | (2,573) | 310
(Loss) Income before income taxes |  |  |  |  |  |  |  |  | (3,763) | 16,473 | 1,478
Identifiable assets | 257,197 |  |  |  | 228,399 |  |  |  | 257,197 | 228,399 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 11,064 | 8,775 | 7,738
Capital expenditures |  |  |  |  |  |  |  |  | 4,537 | 7,355 | 5,279
United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 297,808 | 273,244 | 196,172
Non-US |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,360 | 7,597 | 4,976
Specialty chemicals |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 54,090 | 58,599 | 48,191
Stainless steel pipe and tube |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 167,907 | 146,237 | 100,254
Heavy wall seamless carbon steel pipe and tube |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 30,607 | 32,474 | 25,103
Fiberglass and steel liquid storage tanks and separation equipment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 28,722 | 31,654 | 27,600
Galvanized pipe and tube |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 23,842 | 11,877 | 0
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 305,168 | 280,841 | 201,148
Operating (loss) income |  |  |  |  |  |  |  |  | 6,503 | 31,758 | 10,054
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unallocated corporate expenses |  |  |  |  |  |  |  |  | 8,357 | 7,878 | 6,513
Earn-out adjustments |  |  |  |  |  |  |  |  | (747) | 1,431 | 689
Acquisition related costs |  |  |  |  |  |  |  |  | 601 | 1,212 | 795
Operating (loss) income |  |  |  |  |  |  |  |  | (1,708) | 21,237 | 2,057
Interest expense |  |  |  |  |  |  |  |  | 3,818 | 2,211 | 985
Change in fair value of interest rate swap |  |  |  |  |  |  |  |  | 141 | (20) | (96)
Other income, net |  |  |  |  |  |  |  |  | (1,904) | 2,573 | (310)
(Loss) Income before income taxes |  |  |  |  |  |  |  |  | (3,763) | 16,473 | 1,478
Identifiable assets | 45,011 |  |  |  | 8,028 |  |  |  | 45,011 | 8,028 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 164 | 149 | 155
Capital expenditures |  |  |  |  |  |  |  |  | 568 | 88 | 223
Metals Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating (loss) income |  |  |  |  |  |  |  |  | 3,692 | 27,784 | 5,664
Metals Segment | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 251,078 | 222,242 | 152,957
Gain on sale-leaseback |  |  |  |  |  |  |  |  | 0 | 240 | 240
Operating (loss) income |  |  |  |  |  |  |  |  | 3,692 | 27,544 | 5,424
Identifiable assets | 186,758 |  |  |  | 192,196 |  |  |  | 186,758 | 192,196 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 9,439 | 7,198 | 6,281
Capital expenditures |  |  |  |  |  |  |  |  | 2,812 | 5,969 | 3,406
Specialty Chemicals Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating (loss) income |  |  |  |  |  |  |  |  | 2,811 | 3,974 | 4,390
Specialty Chemicals Segment | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 54,090 | 58,599 | 48,191
Gain on sale-leaseback |  |  |  |  |  |  |  |  | 0 | 95 | 95
Operating (loss) income |  |  |  |  |  |  |  |  | 2,811 | 3,879 | 4,295
Identifiable assets | $ 25,428 |  |  |  | $ 28,175 |  |  |  | 25,428 | 28,175 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,461 | 1,428 | 1,302
Capital expenditures |  |  |  |  |  |  |  |  | $ 1,157 | $ 1,298 | $ 1,650

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