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Acquisitions - Narrative (Details) - USD ($) |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2019 | Dec. 20, 2018 | Jul. 01, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Jun. 29, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Expenses incurred related to acquisition |  |  |  | $ 926,522 | $ (3,835,163) |  |
Estimated interest expense |  |  |  | 1,023,941 | 313,984 |  |
Depreciation expense |  |  |  | 1,889,580 | 1,417,675 |  |
Increase (decrease) in income tax provision |  |  |  | (406,257) | 1,059,000 |  |
Level 3 Inputs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of earn-out liability |  |  |  | 13,213,375 |  | $ 7,609,384 |
American Stainless Tubing, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price | $ 21,895,409 |  |  |  |  |  |
Forecasted earn out payments | 6,700,858 |  |  |  |  |  |
Present value of contingent liability | $ 6,148,230 |  |  |  |  |  |
Amortization expense |  |  |  |  | 312,501 |  |
Additional rent expense |  |  |  |  | 121,449 |  |
Estimated interest expense |  |  |  |  | 210,970 |  |
Depreciation expense |  |  |  |  | 41,252 |  |
Increase (decrease) in income tax provision |  |  |  |  | $ (173,144) |  |
American Stainless Tubing, Inc. | Customer Relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Useful life of finite lived intangible assets acquired | 15 years |  |  |  |  |  |
American Stainless Tubing, Inc. | Fair Value Adjustment to Inventory |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Expenses incurred related to acquisition |  |  |  | 1,147,000 |  |  |
American Stainless Tubing, Inc. | Measurement Input, Discount Rate |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination contingent consideration, fair value measurement input | 0.05 |  |  |  |  |  |
American Stainless Tubing, Inc. | Level 3 Inputs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of earn-out liability |  |  |  | 6,214,001 |  | 0 |
American Stainless Tubing, Inc. | Level 3 Inputs | Other Current Liabilities |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of earn-out liability |  |  |  | 2,713,830 |  |  |
Marcegalia USA, Inc. - Galvanized |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  |  | $ 10,378,281 |  |  |  |
Marcegalia USA, Inc. - Galvanized | Level 3 Inputs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of earn-out liability |  |  |  | $ 2,774,369 |  | $ 3,357,800 |
Term Loan |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Debt term | 5 years | 5 years |  |  |  |  |
Principal amount of debt | $ 20,000,000 | $ 20,000,000 |  |  |  |  |
Revolving Credit Facility | ABL Line Of Credit, Due October 30, 2020 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 100,000,000 |  |  |  |  | $ 80,000,000
American Stainless Tubing, Inc. | American Stainless |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Period for which earn out payments will be received | 3 years |  |  |  |  |  |
American Stainless Tubing, Inc. | Earn-Out Payment | American Stainless |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Earn out payment, target percentage | 6.50% |  |  |  |  |  |

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