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Nature of Operations and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest costs charged to expense | $ 338 | $ 334 | $ 289 | $ 207 | $ 250 | $ 224 | $ 379 | $ 331 | $ 1,168 | $ 1,184 | $ 1,294 |
Plus: Interest cost capitalized |  |  |  |  |  |  |  |  | 562 | 293 | 198 |
Total |  |  |  |  |  |  |  |  | 1,730 | 1,477 | $ 1,492 |
Debt instrument, fair value disclosure | 32,018 |  |  |  | 24,838 |  |  |  | 32,018 | 24,838 |  |
Long-term debt, including current maturities | $ 32,014 |  |  |  | $ 24,554 |  |  |  | $ 32,014 | $ 24,554 |  |
ASU 2016-02 | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Right of use asset |  |  |  |  |  |  |  |  |  |  |  | $ 7,000
Operating lease liability |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000
Building and improvements | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 10 years |  |  |
Building and improvements | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 30 years |  |  |
Machinery and equipment | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 3 years |  |  |
Machinery and equipment | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 10 years |  |  |
Office furniture and equipment | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 5 years |  |  |
Office furniture and equipment | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 10 years |  |  |
Computer equipment and software | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 3 years |  |  |
Computer equipment and software | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 5 years |  |  |
Motor vehicles |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 5 years |  |  |

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