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COMMITMENTS AND CONTINGENCIES (Detail Textuals) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments And Contingencies [Line Items]        
Rental expense for operating leases   $ 1,736 $ 1,730 $ 1,533
Maximum repurchase collateral amount   54,093 $ 45,196  
Pennsylvania        
Commitments And Contingencies [Line Items]        
Total project cost   24,700    
Gain loss on sale of plant $ 601      
Ooltewah, Tennessee and Greeneville, Tennessee        
Commitments And Contingencies [Line Items]        
Estimated costs of project   21,200    
Capital cost incurred   21,000    
Current estimated costs of administrative building   4,200    
Current cost of administrative building incurred   $ 1,581