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Industry Segments - Segment Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | 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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 72,674,176 | $ 77,792,878 | $ 71,893,763 | $ 58,480,602 | $ 52,837,134 | $ 54,595,924 | $ 51,511,045 | $ 42,203,579 | $ 280,841,419 | $ 201,147,682 | $ 138,565,782
Gain (loss) on sale-leaseback | $ (2,455,347) |  |  |  |  |  |  |  |  | 334,273 | 334,273 | (2,371,778)
Earn-out adjustments |  |  |  |  |  |  |  |  |  | 1,430,682 | 688,523 | 0
Operating income (loss) |  |  |  |  |  |  |  |  |  | 21,237,259 | 2,057,128 | (8,246,398)
Acquisition related costs |  |  |  |  |  |  |  |  |  | 1,211,797 | 794,983 | 106,227
Interest expense |  |  |  |  |  |  |  |  |  | 2,210,506 | 985,366 | 932,572
Change in fair value of interest rate swap |  |  |  |  |  |  |  |  |  | (19,484) | (96,696) | 12,997
Other income, net |  |  |  |  |  |  |  |  |  | 2,572,598 | (310,043) | 0
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | 16,473,639 | 1,478,501 | (9,191,967)
Identifiable assets |  | 228,398,846 |  |  |  | 159,874,150 |  |  |  | 228,398,846 | 159,874,150 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 8,775,177 | 7,737,812 | 6,694,990
Capital expenditures |  |  |  |  |  |  |  |  |  | 7,354,737 | 5,278,608 | 3,044,411
United States |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 273,244,175 | 196,172,279 | 132,313,157
Elsewhere |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 7,597,244 | 4,975,403 | 6,252,625
Specialty chemicals |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 58,599,274 | 48,190,487 | 48,351,245
Stainless steel pipe |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 146,237,630 | 100,253,823 | 56,065,642
Seamless carbon steel pipe and tube |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 32,473,950 | 25,103,641 | 14,913,133
Liquid storage tanks and separation equipment |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 31,653,832 | 27,599,731 | 19,235,762
Galvanized pipe and tube |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 11,876,733 | 0 | 0
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 280,841,419 | 201,147,682 | 138,565,782
Operating income (loss) |  |  |  |  |  |  |  |  |  | 31,757,585 | 10,054,473 | (2,305,009)
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unallocated corporate expenses |  |  |  |  |  |  |  |  |  | 7,877,847 | 6,513,839 | 5,835,162
Earn-out adjustments |  |  |  |  |  |  |  |  |  | 1,430,682 | 688,523 | 0
Operating income (loss) |  |  |  |  |  |  |  |  |  | 21,237,259 | 2,057,128 | (8,246,398)
Acquisition related costs |  |  |  |  |  |  |  |  |  | 1,211,797 | 794,983 | 106,227
Interest expense |  |  |  |  |  |  |  |  |  | 2,210,506 | 985,366 | 932,572
Change in fair value of interest rate swap |  |  |  |  |  |  |  |  |  | (19,484) | (96,696) | 12,997
Other income, net |  |  |  |  |  |  |  |  |  | 2,572,598 | (310,043) | 0
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | 16,473,639 | 1,478,501 | (9,191,967)
Identifiable assets |  | 8,028,438 |  |  |  | 4,023,215 |  |  |  | 8,028,438 | 4,023,215 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 149,734 | 154,552 | 113,047
Capital expenditures |  |  |  |  |  |  |  |  |  | 87,759 | 223,089 | 370,173
Metals Segment |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  | 27,783,511 | 5,664,228 | (6,986,510)
Metals Segment | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 222,242,145 | 152,957,195 | 90,214,537
Operating income (loss) |  |  |  |  |  |  |  |  |  | 27,543,907 | 5,424,624 | (4,820,374)
Gain (loss) on sale-leaseback |  |  |  |  |  |  |  |  |  | 239,604 | 239,604 | (2,166,136)
Identifiable assets |  | 192,195,733 |  |  |  | 130,456,857 |  |  |  | 192,195,733 | 130,456,857 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 7,197,814 | 6,280,681 | 5,132,506
Capital expenditures |  |  |  |  |  |  |  |  |  | 5,969,216 | 3,405,552 | 2,198,535
Specialty Chemicals Segment |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  | 3,974,074 | 4,390,245 | 4,681,501
Specialty Chemicals Segment | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 58,599,274 | 48,190,487 | 48,351,245
Operating income (loss) |  |  |  |  |  |  |  |  |  | 3,879,405 | 4,295,576 | 4,887,143
Gain (loss) on sale-leaseback |  |  |  |  |  |  |  |  |  | 94,669 | 94,669 | (205,642)
Identifiable assets |  | $ 28,174,675 |  |  |  | $ 25,394,078 |  |  |  | 28,174,675 | 25,394,078 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,427,629 | 1,302,579 | 1,449,437
Capital expenditures |  |  |  |  |  |  |  |  |  | $ 1,297,762 | $ 1,649,967 | $ 475,703

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