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DEBT - Narrative (Details)
1 Months Ended 6 Months Ended
Mar. 08, 2018
USD ($)
bank
Feb. 28, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Oct. 22, 2020
USD ($)
Jul. 31, 2020
EUR (€)
Jun. 30, 2020
EUR (€)
Jun. 25, 2020
Debt Instrument [Line Items]                    
Outstanding borrowings           $ 11,750,000        
Credit agreement, number of banks | bank 3                  
Amortization of principal, percent 12.50%                  
Repayments on capital expenditure facility     $ 11,750,000 $ 1,562,000            
Maximum amount of shares authorized to sell             $ 75,000,000      
Long-term debt     0     11,264,000        
Debt issuance costs     374,000     486,000        
Capital expenditure facility                    
Debt Instrument [Line Items]                    
Outstanding borrowings           $ 11,750,000        
Credit Facility                    
Debt Instrument [Line Items]                    
Outstanding borrowings     $ 0              
Credit Facility | Syndicated Credit Facility 2018                    
Debt Instrument [Line Items]                    
Credit facility, term 5 years                  
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                  
Repayments on capital expenditure facility   $ 11,750,000                
Credit Facility | Syndicated Credit Facility Amendment | Minimum | London Interbank Offered Rate (LIBOR)                    
Debt Instrument [Line Items]                    
Fixed interest rate                   0.75%
Credit Facility | German Bank Line of Credit                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity | €               € 7,000,000 € 4,000,000  
Available borrowing capacity | €         € 4,085,000