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FINANCING ARRANGEMENTS (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2015
USD ($)
item
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 15, 2017
USD ($)
Financing arrangements              
Loss on Extinguishment of Debt   $ 175   $ 175      
Total long-term debt     $ 5,112     $ 5,657  
Discount on Devicix Notes Payable     (43)     (63)  
Debt Issuance Costs     (212)     (238)  
Long-term Debt     4,857     5,356  
Current maturities of long-term debt     (1,014)     (1,003) [1]  
Long-term debt - net of current maturities     $ 3,843     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)     4.50%        
Outstanding balance     $ 7,142     8,503  
Unused availability supported by entity's borrowing base     $ 6,315        
Devicix Acq Note 1, subordinate debt, due July 1, 2019              
Financing arrangements              
Interest rate (as a percent)     4.00%        
Long-term Debt     $ 265     394  
Devicix Acq Note 2, subordinate debt, due July 1, 2019              
Financing arrangements              
Interest rate (as a percent)     4.00%        
Long-term Debt     $ 345     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)     4.30%        
Long-term Debt     $ 4,502     $ 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