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Long-term Debt (Details) - USD ($)
3 Months Ended 6 Months Ended
Jul. 14, 2020
Apr. 29, 2020
Apr. 21, 2020
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Mar. 31, 2020
Mar. 31, 2015
Debt obligations                  
Total debt obligations             $ 646,333,122 $ 646,128,204  
Less: deferred financing fees       $ 11,152,985 $ 11,834,427   11,834,427 11,152,985  
Total             634,498,695 634,975,219  
Presented as follows:                  
Current portion of long-term debt             70,155,283 53,056,125  
Long-term debt-net of current portion and deferred financing fees             564,343,412 581,919,094  
Total             634,498,695 634,975,219  
Deferred financing fees                  
Deferred finance fees, beginning       11,152,985 11,152,985        
Additions         3,947,005        
Amortization         (3,265,563) $ (1,479,466)      
Deferred finance fees, end         $ 11,834,427        
2015 Facility                  
Long-Term Debt                  
Original loan amount                 $ 758,000,000
Debt obligations                  
Total debt obligations             402,968,058 446,586,121  
Commercial Financing                  
Debt obligations                  
Total debt obligations             155,505,698 163,385,998  
KEXIM Direct Financing                  
Debt obligations                  
Total debt obligations             96,561,085 110,716,127  
KEXIM Guaranteed                  
Debt obligations                  
Total debt obligations             101,007,604 115,385,072  
K-sure Insured                  
Debt obligations                  
Total debt obligations             49,893,671 57,098,924  
Japanese Financings                  
Debt obligations                  
Total debt obligations             243,365,064 199,542,083  
Corsair Japanese Financing                  
Debt obligations                  
Total debt obligations             42,520,833 44,145,833  
Concorde Japanese Financing                  
Debt obligations                  
Total debt obligations             47,115,385 48,730,769  
Corvette Japanese Financing                  
Debt obligations                  
Total debt obligations             47,653,846 49,269,231  
CJNP Japanese Financing                  
Debt obligations                  
Total debt obligations             18,335,000 19,058,750  
CMNL Japanese Financing                  
Debt obligations                  
Total debt obligations             17,391,667 18,076,488  
CNML Japanese Financing                  
Debt obligations                  
Total debt obligations             19,558,333 $ 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             $ 50,790,000    
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