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LONG-TERM OBLIGATIONS (Detail Textuals)
€ in Thousands, $ in Thousands
1 Months Ended 6 Months Ended
Nov. 30, 2017
EUR (€)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Apr. 05, 2017
USD ($)
First Tennessee Bank National Association ("First Tennessee") | Credit Facility        
Line of Credit Facility [Line Items]        
Revolving credit facility       $ 50,000
Description of reference rate basis   LIBOR Rate plus 1.50    
Outstanding borrowings under credit facility   $ 15,000 $ 10,000  
Maturity date   May 31, 2020    
First Tennessee Bank National Association ("First Tennessee") | Credit Facility | Minimum        
Line of Credit Facility [Line Items]        
Non-usage fee for current loan agreement in annual amount percentage   0.15%    
First Tennessee Bank National Association ("First Tennessee") | Credit Facility | Maximum        
Line of Credit Facility [Line Items]        
Non-usage fee for current loan agreement in annual amount percentage   0.35%    
Jige International S.A. | Banque Europeenne du Credit Mutuel        
Line of Credit Facility [Line Items]        
Unsecured fixed rate loan | € € 1,000      
Maturity date Sep. 30, 2020      
Interest rate per annum 0.30%      
Outstanding borrowings under loan agreement   $ 968 606  
Long-term obligations   582 212  
Long-term obligations due within one year   $ 386 $ 394