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DEBT AND CREDIT AGREEMENTS (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 26, 2016
Oct. 31, 2016
Sep. 30, 2018
Dec. 31, 2018
Feb. 25, 2019
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Credit Facilities                
Line of credit       $ 11,000   $ 10,733    
Less: Current portion       (11,930)   (14,252)    
Long-term debt, net of current maturities       1,408   797    
Current borrowing capacity       10,319        
Extinguishment gain       2,249        
Current maturities of long-term debt           114    
Future annual principal payments                
2019       12,045        
2020       913        
2021       266        
2022       114        
Total       13,338        
New Markets Tax Credit Transaction                
Credit Facilities                
NMTC note payable       2,600   2,600    
Extinguishment gain     $ 2,249          
Capital Expenditure loan                
Credit Facilities                
Long-term debt       1,882   1,146    
Current maturities of long-term debt       $ 930   804    
Interest rate (as a percent)       5.00%        
Capital Expenditure loan | Minimum                
Credit Facilities                
Monthly payments on notes payable       $ 3        
Capital Expenditure loan | Maximum                
Credit Facilities                
Monthly payments on notes payable       36        
Development Corporation of Abilene loan                
Credit Facilities                
Long-term debt       456   570   $ 570
Loan forgiven       114        
Credit facility                
Credit Facilities                
Line of credit       $ 0        
Maximum borrowing capacity $ 20,000 $ 10,000     $ 35,000   $ 25,000  
Line of credit facilities, term of credit agreements 3 years              
Maximum borrowing capacity of the face value of eligible A/R (as a percent) 85.00% 85.00%            
Maximum percentage of book value of inventories that may be financed   50.00%   50.00%        
Maximum borrowing capacity of the face value of machinery, equipment and property that may be financed 50.00% 50.00%            
Annual unused line fee (as a percent) 0.50%              
Current borrowing capacity       $ 10,319        
Credit facility | Minimum                
Credit Facilities                
Variable rate basis 2.25%              
Interest rate margin (as a percent) 0.00%              
Credit facility | Maximum                
Credit Facilities                
Maximum borrowing capacity       $ 10,000        
Variable rate basis 3.00%              
Interest rate margin (as a percent) 1.00%              
Term loans and notes payable | New Markets Tax Credit Transaction                
Credit Facilities                
NMTC note payable           $ 2,600