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Fair Value of Financial Instruments - Narrative (Details) shares in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) segment shares | Dec. 31, 2019 USD ($) shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loss (gain) on sale of equity securities |  |  |  | $ (38,000) | $ 326,000
Inventory, net realizable value |  |  | $ 98,186,000 | 85,080,000 | 98,186,000
Goodwill impairment |  |  |  | 16,203,000 | 0
Earn-out adjustments |  |  |  | (1,195,000) | $ (747,000)
American Stainless Tubing, Inc. |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Customer list intangible |  |  | (496,000) |  |
Earn-out adjustments |  | $ 200,000 |  |  |
American Stainless Tubing, Inc. | Customer List |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Customer list intangible |  | $ (500,000) |  |  |
Welded Pipe And Tube |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill impairment | $ 0 |  |  | $ 16,200,000 |
Fair Value, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Number of shares issued in transaction (shares) | shares |  |  |  | 1.2 | 0.5
Loss (gain) on sale of equity securities |  |  |  | $ (37,954) | $ 300,000
Fair value of equity securities |  |  | 4,300,000 | $ 0 | 4,300,000
Derivative asset, number of instruments held | segment |  |  |  | 1 |
Fair Value, Recurring | Palmerof Texas Tanks Inc |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Inventory, net realizable value | 2,100,000 |  |  |  |
Long-lived assets, fair value | 1,400,000 |  |  |  |
Asset impairments | $ 6,200,000 |  |  |  |
Fair Value, Recurring | Interest Rate Swap | Level 2 inputs | Term Loan |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative liability |  |  |  | $ 45,041 |
Derivative asset |  |  | $ 6,088 |  | $ 6,088

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