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DEBT - Narrative (Details)
3 Months Ended 12 Months Ended
Apr. 23, 2020
USD ($)
Apr. 14, 2020
USD ($)
Mar. 08, 2018
USD ($)
bank
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
EUR (€)
Debt Instrument [Line Items]            
Amortization of principal, percent     12.50%      
Credit agreement, number of banks | bank     3      
Debt issuance costs       $ 563,000 $ 603,000  
Paycheck protection program loan | Unsecured Debt | Subsequent Event            
Debt Instrument [Line Items]            
Proceeds from long-term debt   $ 6,700,000        
Return of loan proceeds to the SBA $ 6,700,000          
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 | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable interest rate       1.50%    
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 | Maximum | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable interest rate       3.00%    
Credit Facility | Alternate currencies revolving loan | Maximum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable interest rate       2.00%    
Credit Facility | Capital expenditure facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity     $ 25,000,000      
LIBOR-based variable rate       2.49%   2.49%
Line of credit facility, prepayment amount         $ 7,000,000  
Credit Facility | German bank line of credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity | €           € 4,000,000
Available borrowing capacity | €           € 881,000