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Acquisitions - Narrative (Details) - USD ($) |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 10 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2019 | Dec. 20, 2018 | Jul. 01, 2018 | Mar. 01, 2017 | Feb. 28, 2017 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Jun. 29, 2018 | Mar. 31, 2017 | Dec. 09, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charge related to change in fair value of earn-out liability |  |  |  |  |  |  |  |  |  |  |  | $ (747,000) | $ 1,431,000 | $ 688,000 |  |  |  |
Expenses incurred related to acquisition |  |  |  |  |  |  |  |  |  |  |  | (1,904,000) | 2,573,000 | (310,000) |  |  |  |
Additional rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 | 3,300,000 |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  | 3,818,000 | 2,211,000 | 985,000 |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  | 7,578,000 | 6,412,000 | 5,295,000 |  |  |  |
Increase (decreases) in income tax provision |  |  |  |  |  |  |  |  |  |  |  | (727,000) | 3,376,000 | 137,000 |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  | 601,000 | 1,212,000 | 795,000 |  |  |  |
Goodwill |  |  |  |  |  |  | $ 9,800,000 |  | $ 9,800,000 | $ 17,558,000 | $ 6,004,000 | 17,558,000 | 9,800,000 | 6,004,000 |  |  |  |
Lease term | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |
Level 3 Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of earn-out liability |  |  |  |  |  |  | 7,610,000 |  | 7,610,000 | 9,154,000 | 4,834,000 | 9,154,000 | 7,610,000 | 4,834,000 |  |  |  |
American Stainless Tubing, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price | $ 21,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Charge related to change in fair value of earn-out liability |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |
Customer list intangible |  |  |  |  |  |  |  |  |  | (496,000) |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 714,000 |  |  |  |  |  |  |  |
Additional rent expense |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |
Increase (decreases) in income tax provision |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |
Fair value of earn-out payments |  |  |  |  |  |  |  |  |  | 6,366,000 |  | 6,366,000 |  |  | $ 6,148,000 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 7,758,000 |  | 7,758,000 |  |  | 7,044,000 |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  | 9,504,000 |  | 9,504,000 |  |  | $ 10,000,000 |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 34,477,000 |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  | 2,690,000 |  |  |  |  |  |
American Stainless Tubing, Inc. | Fair Value Adjustment to Inventory |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses incurred related to acquisition |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |
American Stainless Tubing, Inc. | Customer List |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer list intangible |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |
American Stainless Tubing, Inc. | Customer Lists |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer list intangible |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |
MUSA-Galvanized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 10,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for which earn out payments will be received |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn out payments, target percentage |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer list intangible |  |  |  |  |  |  |  |  | (251,000) |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 300,000 |  | 251,000 |  |  |  |  |  |  |  |  |
Forecasted earn-out payments |  |  | $ 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of earn-out payments |  |  | 3,800,000 |  |  |  | 3,800,000 |  | 3,800,000 |  |  |  | 3,800,000 |  |  |  |  |
Purchase accounting adjustment for intangible assets |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 3,545,000 |  |  |  | 3,796,000 |  | 3,796,000 |  |  |  | 3,796,000 |  |  |  |  |
Intangible assets |  |  | $ 1,424,000 |  |  |  | 1,173,000 |  | 1,173,000 |  |  |  | 1,173,000 |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 11,877,000 |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 65,000 |  |  |  |  |
MUSA-Galvanized | Earn-Out Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for which earn out payments will be received |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MUSA-Galvanized | Acquisition-related Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |
MUSA-Galvanized | Customer List |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life of finite lived intangible assets acquired |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MUSA-Galvanized | Level 3 Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of earn-out liability |  |  |  |  |  |  | 3,358,000 |  | 3,358,000 | 1,782,000 | 0 | $ 1,782,000 | 3,358,000 | 0 |  |  |  |
MUSA-Galvanized | Level 3 Inputs | Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of earn-out liability |  |  |  |  |  |  | 1,000,000 |  | 1,000,000 |  |  |  | 1,000,000 |  |  |  |  |
MUSA-Galvanized | Measurement Input, Discount Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate applied to earn-out payments |  |  | 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MUSA-Stainless |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Customer list intangible |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | 1,059,000 |  |  |  |  |  |  |
Goodwill and earn-out liability, provisional adjustment |  |  |  |  |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |
Fair value of earn-out payments |  |  |  |  | 3,604,000 |  |  | 4,700,000 |  |  | 4,664,000 |  |  | 4,664,000 |  |  | $ 3,600,000 |
Goodwill |  |  |  |  | 3,589,000 |  |  | $ 4,600,000 |  |  | 4,649,000 |  |  | 4,649,000 |  |  | $ 3,600,000 |
Intangible assets |  |  |  |  | $ 992,000 |  |  |  |  |  | 992,000 |  |  | 992,000 |  |  |  |
Escrow deposit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,800,000 |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |
Monthly lease payment |  |  |  | $ 33,333 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease term |  |  |  | 15 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
MUSA-Stainless | Earn-Out Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for which earn out payments will be received |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |
Earn out payments, target percentage |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Forecasted earn-out payments |  |  |  |  | $ 4,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration payment, lower limit |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated earn out payments, discounted |  |  |  |  | $ 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate applicable to future revenue |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |
MUSA-Stainless | Customer List |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life of finite lived intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
MUSA-Stainless | Level 3 Inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of earn-out liability |  |  |  |  |  |  | $ 4,252,000 |  | $ 4,252,000 | $ 2,403,000 | $ 4,834,000 | $ 2,403,000 | $ 4,252,000 | $ 4,834,000 |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 20,000,000 | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
American Stainless | American Stainless Tubing, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for which earn out payments will be received | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
American Stainless | American Stainless Tubing, Inc. | Earn-Out Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn out payments, target percentage | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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