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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