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Note 5 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 16, 2020
Apr. 08, 2019
Sep. 30, 2019
Mar. 31, 2020
Mar. 31, 2019
Mar. 27, 2018
Jan. 31, 2018
May 04, 2016
Amortization of Debt Issuance Costs       $ 486 $ 434      
Payments of Financing Costs, Total       61 $ 18      
Revolving Credit Facility [Member]                
Long-term Line of Credit, Total       $ 45,000        
Credit Agreement [Member] | Revolving Credit Facility [Member]                
Line of Credit Facility, Maximum Borrowing Capacity           $ 45,000    
Credit Agreement [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate       3.00%        
Debt Instrument, Interest Rate, Effective Percentage       3.99%        
Credit Agreement [Member] | Letter of Credit [Member]                
Line of Credit Facility, Maximum Borrowing Capacity           5,000    
Credit Agreement [Member] | Senior Secured Term Loan Facility [Member]                
Debt Instrument, Face Amount           $ 200,000    
Debt Instrument, Interest Rate, Effective Percentage       4.24%        
Credit Agreement [Member] | Senior Secured Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate       3.25%        
Export Credit Agreement [Member]                
Debt Agreement, Maximum Borrowing Capacity   $ 122,800         $ 107,700  
Percentage of Purchase Price, Financing Maximum   80.00%         80.00%  
Proceeds from Lines of Credit, Total $ 107,700     $ 107,700        
Export Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate       3.00%        
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate       4.45%        
Second Export Credit Agreement [Member]                
Proceeds from Lines of Credit, Total     $ 30,500          
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   6.36%            
Payments of Financing Costs, Total   $ 2,300            
Second Export Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate   3.00%   3.00%        
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate       4.45%        
Promissory Notes, Natural Habitat Acquisition [Member]                
Debt Instrument, Face Amount       $ 2,500       $ 2,500
Debt Instrument, Interest Rate, Stated Percentage       1.44%