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Industry Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 69,778 | $ 74,697 |
Operating income | 2,105 | (927) |
Unallocated corporate expenses | 6,869 | 7,770 |
Acquisition costs and other | 0 | 304 |
Proxy contest costs and recoveries | (464) | 0 | $ 3,100
Earn-out adjustments | 225 | 4 |
Interest expense | 387 | 719 |
Loss on extinguishment of debt | 223 | 0 |
Change in fair value of interest rate swap | (2) | 85 |
Other, net | 162 | 827 |
Income (loss) before income taxes | 1,335 | (2,558) |
Identifiable assets | 215,327 |  | 206,984
Metals Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 55,213 | 60,664 |
Specialty Chemicals Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 14,565 | 14,033 |
Operating segment | Metals Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income | 2,577 | 934 |
Identifiable assets | 151,657 |  | 141,799
Operating segment | Specialty Chemicals Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income | 1,056 | 466 |
Identifiable assets | 27,612 |  | 25,039
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Unallocated corporate expenses | 1,767 | 2,019 |
Acquisition costs and other | 0 | 304 |
Earn-out adjustments | 225 | $ 4 |
Identifiable assets | $ 36,058 |  | $ 40,146

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