Goodwill and Intangible Assets - Narrative (Details) - USD ($)  | 
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Sep. 30, 2020  | 
Jun. 30, 2020  | 
Sep. 30, 2019  | 
Sep. 30, 2020  | 
Sep. 30, 2019  | 
Dec. 31, 2019  | 
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| Goodwill [Line Items] | ||||||
| Balance at September 30, 2020 | $ 6,810,000 | $ 6,810,000 | ||||
| Goodwill impairment | 10,748,000 | $ 0 | 10,748,000 | $ 0 | ||
| Estimated fair market value | 12,131,000 | $ 12,131,000 | $ 15,714,000 | |||
| Palmer of Texas | Customer Lists | ||||||
| Goodwill [Line Items] | ||||||
| Estimated fair market value | $ 0 | |||||
| Asset impairments | $ 1,300,000 | |||||
| Welded Pipe & Tube | ||||||
| Goodwill [Line Items] | ||||||
| Fair value greater than carrying value | 1.70% | |||||
| Goodwill impairment | $ 10,700,000 | $ 0 | ||||
| Fair value less than carrying value | 9.70% | 9.70% | ||||
| Metals Segment | ||||||
| Goodwill [Line Items] | ||||||
| Balance at September 30, 2020 | $ 5,455,000 | $ 5,455,000 | ||||
| Goodwill impairment | 10,748,000 | |||||
| Metals Segment | Welded Pipe & Tube | ||||||
| Goodwill [Line Items] | ||||||
| Balance at September 30, 2020 | $ 16,200,000 | $ 16,200,000 | $ 16,200,000 | |||
| X | ||||||||||
- Definition Reporting Unit, Percentage of Fair Value Below Carrying Amount No definition available. 
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| X | ||||||||||
- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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| X | ||||||||||
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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| X | ||||||||||
- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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| X | ||||||||||
- Definition Percentage of fair value of reporting unit in excess of carrying amount. No definition available. 
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