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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Line Items] |  |  |
Interest costs charged to expense | $ 2,267 | $ 1,305 | $ 1,168
Plus: Interest cost capitalized | 246 | 575 | 562
Total | 2,513 | 1,880 | $ 1,730
Debt instrument, fair value disclosure | 44,548 | 42,534 |
Long-term debt, including current maturities | $ 39,871 | $ 41,060 |
Minimum |  |  |
Accounting Policies [Line Items] |  |  |
Derivative, Term of Contract | 1 month |  |
Maximum |  |  |
Accounting Policies [Line Items] |  |  |
Derivative, Term of Contract | 24 months |  |
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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