Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 71,935,018	$ 92,564,653	$ 111,841,258
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	66,432,115	68,462,476	66,262,530
Amortization of operating lease right-of-use assets	9,576,822	9,218,537	1,885,522
Amortization of financing costs	5,889,040	4,695,360	2,893,392
Unrealized (gain)/loss on derivatives	(11,067,870)	(7,202,880)	18,206,769
Stock-based compensation expense	3,332,279	3,356,199	3,227,686
Gain on disposal of vessels	(7,256,897)
Unrealized foreign currency (gain)/loss, net	166,873	(210,010)	311,539
Other non-cash items, net	1,267,576	(1,091,825)	(1,200,001)
Changes in operating assets and liabilities
Trade receivables, net and accrued revenue	(650,839)	618,625	563,272
Prepaid expenses and other current assets	(2,607,346)	(1,192,336)	(222,510)
Due from related parties	897,936	10,656,326	(25,692,058)
Inventories	(258,887)	(11,261)	115,434
Other non-current assets	(552,201)	1,490,267	(1,356,007)
Operating lease liabilities-current and long-term	(9,590,424)	(9,221,782)	(1,888,347)
Trade accounts payable	(115,287)	212,173	1,470,669
Accrued expenses and other liabilities	(4,889,118)	4,309,014	(2,078,325)
Due to related parties	(80,370)	(319,047)	(52,794)
Payments for drydocking costs	(3,733,250)	(5,738,793)	(5,251,622)
Net cash provided by operating activities	118,695,170	170,595,696	169,036,407
Cash flows from investing activities:
Payments for vessel under construction and vessel capital expenditures	(23,185,913)	(9,492,953)	(19,883,090)
Payments for short-term investments			(14,888,638)
Purchases of investment securities	(2,250,681)	(4,743,809)
Proceeds from sale of investment securities	3,742,429	275,393	1,767,906
Proceeds from maturity of short-term investments		15,000,000
Proceeds from disposal of vessels	90,460,363
Payments to acquire other fixed assets		(17,541)	(141,012)
Net cash provided by/(used in) investing activities	68,766,198	1,021,090	(33,144,834)
Cash flows from financing activities:
Proceeds from long-term debt borrowings	298,250,000	55,378,172
Repayment of long-term debt borrowings	(230,317,537)	(99,418,395)	(63,968,414)
Repurchase of common stock	(21,364,822)	(126,260,923)	(50,642,795)
Financing costs paid	(1,664,252)	(4,183,321)	(40,547)
Dividends paid	(80,082,210)
Net cash used in financing activities	(35,178,821)	(174,484,467)	(114,651,756)
Effects of exchange rates on cash and cash equivalents	(172,832)	205,753	(323,336)
Net increase/(decrease) in cash, cash equivalents, and restricted cash	152,109,715	(2,661,928)	20,916,481
Cash, cash equivalents, and restricted cash at the beginning of the period	84,727,199	87,389,127	66,472,646
Cash, cash equivalents, and restricted cash at the end of the period	236,836,914	84,727,199	87,389,127
Supplemental disclosure of cash flow information
Cash paid during the period for interest	20,591,883	21,787,205	32,461,153
Cash paid for amounts included in the measurement of operating lease liabilities	10,082,984	10,088,410	2,810,468
Vessel-related capital expenditures included in liabilities	107,275	320,992	4,408,333
Unpaid dividends included in liabilities	494,180
Financing costs included in liabilities	$ 1,689,600	$ 596,800	$ 595,138