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FINANCING ARRANGEMENTS (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Jul. 01, 2015
USD ($)
item
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 15, 2017
USD ($)
Financing arrangements            
Loss on Extinguishment of Debt     $ 175      
Total long-term debt   $ 4,837     $ 5,657  
Discount on Devicix Notes Payable   (33)     (63)  
Debt Issuance Costs   (198)     (238)  
Long-term Debt   4,606     5,356  
Current maturities of long-term debt   (871)     (1,003) [1]  
Long-term debt - net of current maturities   $ 3,735     4,353 [1]  
Devicix, LLC            
Financing arrangements            
Number of promissory notes | item 2          
Line of credit            
Financing arrangements            
Weighted-average interest rate (as a percent)   4.30%        
Outstanding balance   $ 8,058     8,503  
Unused availability supported by entity's borrowing base   $ 4,797        
Devicix Acq Note 1, subordinate debt, due July 1, 2019            
Financing arrangements            
Interest rate (as a percent)   4.00%        
Long-term Debt   $ 200     394  
Devicix Acq Note 2, subordinate debt, due July 1, 2019            
Financing arrangements            
Interest rate (as a percent)   4.00%        
Long-term Debt   $ 260     512  
Promissory note subject to offsets | Devicix, LLC            
Financing arrangements            
Promissory note liability $ 1,000          
Term of promissory note 4 years          
Interest rate per annum 4.00%          
Principal and interest payments $ 23          
Promissory note not subject to offsets | Devicix, LLC            
Financing arrangements            
Promissory note liability $ 1,300          
Term of promissory note 4 years          
Interest rate per annum 4.00%          
Principal and interest payments $ 29          
Bank of America | Line of credit            
Financing arrangements            
Maximum borrowing capacity           $ 16,000
Bank of America | Real estate term notes            
Financing arrangements            
Debt instrument, face amount           $ 5,000
Variable rate basis   one-month LIBOR        
Interest rate margin on variable rate basis (as a percent)   2.25%        
Interest rate (as a percent)   4.50%        
Long-term Debt   $ 4,377     $ 4,751  
Principal and interest payments   $ 41        
Bank of America | Credit Agreement            
Financing arrangements            
Minimum fixed charge coverage ratio   1.00        
Minimum level of cumulative EBITDA       $ 1,970    
Wells Fargo Bank, N.A.            
Financing arrangements            
Loss on Extinguishment of Debt   $ 175        
[1] The balance sheet at December 31, 2017 has been derived from the audited financial statements at that date