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Debt (Details Textual) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Aug. 04, 2016
Mar. 10, 2016
Jan. 13, 2016
Sep. 12, 2014
Oct. 24, 2017
May 30, 2017
Jan. 22, 2016
May 22, 2014
Mar. 31, 2019
Required Minimum Solvency Covenant                 30.00%
Required Minimum Cash Balance                 $ 22.4
Minimum Net Worth Required                 $ 150.0
Minimum [Member]                  
Cash and Cash Equivalent Percentage                 5.00%
Fair market Value Percentage                 130.00%
NIBC Bank Facility [Member]                  
Line of Credit Facility, Maximum Borrowing Capacity       $ 13.5       $ 39.0  
Debt Instrument, Description of Variable Rate Basis       LIBOR plus 2.90%          
Debt Instrument Maturity Period                 September 2021
NIBC Bank Facility [Member] | Tranche I [Member]                  
Debt Instrument, Basis Spread on Variable Rate   2.50%              
Long-term Line of Credit   $ 2.3              
Proceeds from Lines of Credit   25.0              
NIBC Bank Facility [Member] | Additional Financing [Member]                  
Short-term Debt, Refinanced, Amount   $ 25.0              
ABN/DVB/NIBC Joint Bank Facility [Member]                  
Line of Credit Facility, Maximum Borrowing Capacity     $ 213.0            
Line Of Credit Facility Maximum Borrowing Capacity Increase Amount $ 36.6                
Short-term Debt, Refinanced, Amount           $ 20.1      
Debt Instrument, Description of Variable Rate Basis LIBOR plus 2.75%   LIBOR plus 2.55%            
ABN/DVB/NIBC Joint Bank Facility [Member] | LIBOR [Member]                  
Debt Instrument Maturity Period     2022            
Nordea/SEB Joint Bank Facility [Member]                  
Line of Credit Facility, Maximum Borrowing Capacity     $ 151.0            
Debt Instrument, Description of Variable Rate Basis     LIBOR plus 2.50%            
Debt Instrument Maturity Period             2022    
ABN Revolving Facility [Member]                  
Debt Instrument, Description of Variable Rate Basis     LIBOR plus 3.5%            
Debt Instrument Maturity Period         2020        
Short-term Debt         $ 15.0        
CACIB Bank Facility [Member]                  
Debt Instrument, Description of Variable Rate Basis               LIBOR plus 2.50%  
CACIB Bank Facility [Member] | LIBOR [Member]                  
Debt Instrument Maturity Period   2022