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DEBT - Narrative (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 25, 2020
USD ($)
Mar. 08, 2018
USD ($)
bank
Jun. 30, 2020
EUR (€)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Oct. 22, 2020
USD ($)
Sep. 30, 2020
EUR (€)
Jul. 30, 2020
EUR (€)
Debt Instrument [Line Items]                
Amortization of principal, percent   12.50%            
Credit agreement, number of banks | bank   3            
Debt issuance costs       $ 539,000 $ 603,000      
Subsequent Event                
Debt Instrument [Line Items]                
Maximum amount of shares authorized to sell           $ 75,000,000    
Syndicated Credit Facility Amendment | Minimum                
Debt Instrument [Line Items]                
Coverage ratio     1.35          
Credit Facility                
Debt Instrument [Line Items]                
Credit facility, term   5 years            
Credit Facility | Syndicated Credit Facility 2018                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 75,000,000            
Accordion feature   100,000,000            
Credit Facility | U.S. Dollar revolving loan                
Debt Instrument [Line Items]                
Maximum borrowing capacity   50,000,000            
Credit Facility | Alternate Currencies Revolving Loan                
Debt Instrument [Line Items]                
Maximum borrowing capacity   20,000,000            
Credit Facility | Alternate Currencies Revolving Loan | Minimum | Base Rate                
Debt Instrument [Line Items]                
Basis spread on variable interest rate       0.50%        
Credit Facility | Alternate Currencies Revolving Loan | Minimum | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable interest rate       1.50%        
Credit Facility | Alternate Currencies Revolving Loan | Maximum | Base Rate                
Debt Instrument [Line Items]                
Basis spread on variable interest rate       2.00%        
Credit Facility | Alternate Currencies Revolving Loan | Maximum | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable interest rate       3.00%        
Credit Facility | Capital expenditure facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 25,000,000            
LIBOR-based variable rate       2.50%     2.50%  
Line of credit facility, prepayment amount         $ 7,000,000      
Credit Facility | Syndicated Credit Facility Amendment                
Debt Instrument [Line Items]                
Minimum liquidity covenant $ 10,000,000              
Credit Facility | Syndicated Credit Facility Amendment | Base Rate                
Debt Instrument [Line Items]                
Basis spread on variable interest rate 0.75%              
Credit Facility | Syndicated Credit Facility Amendment | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable interest rate 1.75%              
Credit Facility | Syndicated Credit Facility Amendment | Minimum | Base Rate                
Debt Instrument [Line Items]                
Basis spread on variable interest rate 0.75%              
Credit Facility | Syndicated Credit Facility Amendment | Minimum | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable interest rate 1.75%              
Fixed interest rate 0.75%              
Credit Facility | Syndicated Credit Facility Amendment | Maximum | Base Rate                
Debt Instrument [Line Items]                
Basis spread on variable interest rate 2.00%              
Credit Facility | Syndicated Credit Facility Amendment | Maximum | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable interest rate 3.00%              
Credit Facility | German Bank Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity | €     € 4,000,000         € 7,000,000
Available borrowing capacity | €             € 3,511,000