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Long-term Debt (Details) - USD ($)
3 Months Ended
Jul. 14, 2020
Apr. 29, 2020
Apr. 21, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Mar. 31, 2020
Mar. 31, 2015
Debt obligations                
Total debt obligations           $ 659,650,068 $ 646,128,204  
Less: deferred financing fees       $ 11,152,985   12,136,080 11,152,985  
Total           647,513,988 634,975,219  
Presented as follows:                
Current portion of long-term debt           53,267,783 53,056,125  
Long-term debt-net of current portion and deferred financing fees           594,246,205 581,919,094  
Total           647,513,988 634,975,219  
Deferred financing fees                
Deferred finance fees, beginning       11,152,985        
Additions       3,377,605        
Amortization       (2,394,510) $ (744,271)      
Deferred finance fees, end       $ 12,136,080        
2015 Facility                
Long-Term Debt                
Original loan amount               $ 758,000,000
Debt obligations                
Total debt obligations           411,946,494 446,586,121  
Commercial Financing                
Debt obligations                
Total debt obligations           155,655,698 163,385,998  
KEXIM Direct Financing                
Debt obligations                
Total debt obligations           100,104,372 110,716,127  
KEXIM Guaranteed                
Debt obligations                
Total debt obligations           104,512,865 115,385,072  
K-sure Insured                
Debt obligations                
Total debt obligations           51,673,559 57,098,924  
Japanese Financings                
Debt obligations                
Total debt obligations           247,703,574 199,542,083  
Corsair Japanese Financing                
Debt obligations                
Total debt obligations           43,333,333 44,145,833  
Concorde Japanese Financing                
Debt obligations                
Total debt obligations           47,923,077 48,730,769  
Corvette Japanese Financing                
Debt obligations                
Total debt obligations           48,461,538 49,269,231  
CJNP Japanese Financing                
Debt obligations                
Total debt obligations           18,696,875 19,058,750  
CMNL Japanese Financing                
Debt obligations                
Total debt obligations           17,734,078 18,076,488  
CNML Japanese Financing                
Debt obligations                
Total debt obligations           19,909,673 $ 20,261,012  
Cresques Japanese Financing                
Long-Term Debt                
Monthly brokerage commission (as a percent)     1.25%          
Percentage of broker commission fee payable     0.50%          
Principal payment frequency     monthly          
Periodic principal payment amount     $ 300,000          
Balloon payment amount     $ 11,500,000          
Debt obligations                
Total debt obligations           51,645,000    
Refinancing Of Commercial Tranche Of 2015 Facility                
Long-Term Debt                
Additional basis points to decrease the margin   0.10%            
Basis points receivable as increase or reduction for changes in Average Efficiency Ratio   0.10%            
Security leverage ratio   40.00%            
New senior secured term loan facility                
Long-Term Debt                
Original loan amount   $ 155,800,000            
2015 AR Facility                
Long-Term Debt                
Minimum stockholder's equity balance $ 400,000,000              
Minimum liquidity covenant 27,500,000         40,000,000    
Minimum cash per mortgaged vessel from first anniversary through thereafter $ 1,000,000.0         $ 2,200,000    
Percentage of increase in security value ratio 145.00%     135.00%        
Minimum | Refinancing Of Commercial Tranche Of 2015 Facility                
Long-Term Debt                
Additional basis points to increase the margin   0.10%            
Maximum | Refinancing Of Commercial Tranche Of 2015 Facility                
Long-Term Debt                
Security leverage ratio   60.00%            
Maximum | New senior secured revolving credit facility                
Long-Term Debt                
Original loan amount   $ 25,000,000.0            
LIBOR | Cresques Japanese Financing                
Long-Term Debt                
Margin added to LIBOR for interest rate on loan facility (as a percent)     2.50%          
LIBOR | Refinancing Of Commercial Tranche Of 2015 Facility                
Long-Term Debt                
Margin added to LIBOR for interest rate on loan facility (as a percent)   2.50%            
Dorian Dubai LPG Transport LLC (Cresques)                
Long-Term Debt                
Value of vessel transferred     $ 71,500,000          
Term of Charter Agreement     12 years          
Period until purchase option exercisable     3 years          
Proceeds from sale of vessel     $ 52,500,000          
Deposit retained by buyer     19,000,000.0          
Repayment of debt     $ 28,500,000