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FINANCING ARRANGEMENTS (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 01, 2015
USD ($)
item
Mar. 31, 2019
USD ($)
Mar. 31, 2018
Dec. 31, 2018
USD ($)
Jun. 15, 2017
USD ($)
FINANCING ARRANGEMENTS          
Total long-term debt   $ 4,283   $ 4,612  
Discount on Devicix Notes Payable   (13)   (23)  
Debt Issuance Costs   (172)   (185)  
Total long-term debt   4,098   4,404  
Current maturities of long-term debt   (586)   (780) [1]  
Long-term debt - net of current maturities   $ 3,513   3,624 [1]  
Devicix, LLC          
FINANCING ARRANGEMENTS          
Number of promissory notes | item 2        
Line of credit          
FINANCING ARRANGEMENTS          
Weighted-average interest rate (as a percent)   5.60% 3.00%    
Outstanding balance   $ 11,294   9,264  
Unused availability supported by entity's borrowing base   $ 4,706      
Devicix Acq Note 1, subordinate debt, due July 1, 2019          
FINANCING ARRANGEMENTS          
Interest rate (as a percent)   4.00%      
Total long-term debt   $ 67   156  
Devicix Acq Note 2, subordinate debt, due July 1, 2019          
FINANCING ARRANGEMENTS          
Interest rate (as a percent)   4.00%      
Total long-term debt   $ 87   $ 203  
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   one-month LIBOR  
Interest rate margin on variable rate basis (as a percent)   2.25%   2.25%  
Interest rate (as a percent)   4.80%   4.80%  
Total long-term debt   $ 4,129   $ 4,253  
Principal and interest payments   $ 41      
Bank of America | Credit Agreement          
FINANCING ARRANGEMENTS          
Minimum fixed charge coverage ratio   1.00      
[1] The balance sheet at December 31, 2018 has been derived from the audited financial statements at that date.