Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income/(loss)	$ 92,564,653	$ 111,841,258	$ (50,945,905)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Depreciation and amortization	68,462,476	66,262,530	65,201,151
Amortization of operating lease right-of-use asset	9,218,537	1,885,522
Amortization of financing costs	4,695,360	2,893,392	3,136,051
Unrealized (gain)/loss on derivatives	(7,202,880)	18,206,769	7,816,401
Stock-based compensation expense	3,356,199	3,227,686	5,476,234
Unrealized foreign currency (gain)/loss, net	(210,010)	311,539	303,835
Other non-cash items, net	(1,091,825)	(1,200,001)	(48,182)
Changes in operating assets and liabilities
Trade receivables, net and accrued revenue	618,625	563,272	(1,047,956)
Prepaid expenses and other current assets	(1,192,336)	(222,510)	(537,549)
Due from related parties	10,656,326	(25,692,058)	(17,574,923)
Inventories	(11,261)	115,434	(98,730)
Other non-current assets	1,490,267	(1,356,007)	(131,457)
Operating lease liabilities-current and long-term	(9,221,782)	(1,888,347)
Trade accounts payable	212,173	1,470,669	793,925
Accrued expenses and other liabilities	4,309,014	(2,078,325)	(2,999,444)
Due to related parties	(319,047)	(52,794)	144,129
Payments for drydocking costs	(5,738,793)	(5,251,622)	(604,147)
Net cash provided by operating activities	170,595,696	169,036,407	8,883,433
Cash flows from investing activities:
Vessel-related capital expenditures	(9,492,953)	(19,883,090)	(3,972,815)
Payments for short-term investments		(14,888,638)
Purchases of investment securities	(4,743,809)		(499,690)
Proceeds from sale of investment securities	275,393	1,767,906
Proceeds from maturity of short-term investments	15,000,000
Payments to acquire other fixed assets	(17,541)	(141,012)	(47,799)
Net cash provided by/(used in) investing activities	1,021,090	(33,144,834)	(4,520,304)
Cash flows from financing activities:
Proceeds from long-term debt borrowings	55,378,172		65,137,500
Repayment of long-term debt borrowings	(99,418,395)	(63,968,414)	(130,205,069)
Purchase of treasury stock	(126,260,923)	(50,642,795)	(1,310,064)
Financing costs paid	(4,183,321)	(40,547)	(628,144)
Net cash used in financing activities	(174,484,467)	(114,651,756)	(67,005,777)
Effects of exchange rates on cash and cash equivalents	205,753	(323,336)	(253,086)
Net increase/(decrease) in cash, cash equivalents, and restricted cash	(2,661,928)	20,916,481	(62,895,734)
Cash, cash equivalents, and restricted cash at the beginning of the period	87,389,127	66,472,646	129,368,380
Cash, cash equivalents, and restricted cash at the end of the period	84,727,199	87,389,127	66,472,646
Supplemental disclosure of cash flow information
Cash paid during the period for interest	21,787,205	32,461,153	36,906,567
Cash paid for amounts included in the measurement of operating lease liabilities	10,088,410	2,810,468
Vessel-related capital expenditures included in liabilities	320,992	4,408,333	33,015
Financing costs included in liabilities	$ 596,800	$ 595,138	$ 595,138