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Condensed Consolidated Statements of Shareholders' Equity - USD ($)	Common stock	Treasury stock	Additional paid-in capital	Retained earnings	Total
Balance at Mar. 31, 2018	$ 586,402	$ (35,223,428)	$ 858,109,882	$ 135,940,506	$ 959,413,362
Balance (in shares) at Mar. 31, 2018	58,640,161
Increase (Decrease) in Shareholders' Equity
Net income/(loss) for the period				(20,596,558)	(20,596,558)
Restricted share award issuances	$ 2,095		(2,095)
Restricted share award issuances (in shares)	209,552
Stock-based compensation			1,632,538		1,632,538
Purchase of treasury stock		(1,133,018)			(1,133,018)
Balance at Jun. 30, 2018	$ 588,497	(36,356,446)	859,740,325	115,343,948	939,316,324
Balance (in shares) at Jun. 30, 2018	58,849,713
Balance at Mar. 31, 2018	$ 586,402	(35,223,428)	858,109,882	135,940,506	959,413,362
Balance (in shares) at Mar. 31, 2018	58,640,161
Increase (Decrease) in Shareholders' Equity
Net income/(loss) for the period					(34,992,330)
Balance at Dec. 31, 2018	$ 588,699	(36,356,446)	862,295,309	100,948,176	927,475,738
Balance (in shares) at Dec. 31, 2018	58,869,711
Balance at Jun. 30, 2018	$ 588,497	(36,356,446)	859,740,325	115,343,948	939,316,324
Balance (in shares) at Jun. 30, 2018	58,849,713
Increase (Decrease) in Shareholders' Equity
Net income/(loss) for the period				(8,177,120)	(8,177,120)
Restricted share award issuances	$ 98		(98)
Restricted share award issuances (in shares)	9,582
Stock-based compensation			1,324,861		1,324,861
Balance at Sep. 30, 2018	$ 588,595	(36,356,446)	861,065,088	107,166,828	932,464,065
Balance (in shares) at Sep. 30, 2018	58,859,295
Increase (Decrease) in Shareholders' Equity
Net income/(loss) for the period				(6,218,652)	(6,218,652)
Restricted share award issuances	$ 104		(104)
Restricted share award issuances (in shares)	10,416
Stock-based compensation			1,230,325		1,230,325
Balance at Dec. 31, 2018	$ 588,699	(36,356,446)	862,295,309	100,948,176	927,475,738
Balance (in shares) at Dec. 31, 2018	58,869,711
Balance at Mar. 31, 2019	$ 588,826	(36,484,561)	863,583,692	84,994,601	912,682,558
Balance (in shares) at Mar. 31, 2019	58,882,515
Increase (Decrease) in Shareholders' Equity
Net income/(loss) for the period				6,075,059	6,075,059
Restricted share award issuances	$ 78		(78)
Restricted share award issuances (in shares)	7,750
Stock-based compensation			1,305,827		1,305,827
Purchase of treasury stock		(983,582)			(983,582)
Balance at Jun. 30, 2019	$ 588,904	(37,468,143)	864,889,441	91,069,660	919,079,862
Balance (in shares) at Jun. 30, 2019	58,890,265
Balance at Mar. 31, 2019	$ 588,826	(36,484,561)	863,583,692	84,994,601	912,682,558
Balance (in shares) at Mar. 31, 2019	58,882,515
Increase (Decrease) in Shareholders' Equity
Net income/(loss) for the period					82,415,867
Balance at Dec. 31, 2019	$ 590,783	(52,406,243)	866,429,768	167,410,468	982,024,776
Balance (in shares) at Dec. 31, 2019	59,078,230
Balance at Jun. 30, 2019	$ 588,904	(37,468,143)	864,889,441	91,069,660	919,079,862
Balance (in shares) at Jun. 30, 2019	58,890,265
Increase (Decrease) in Shareholders' Equity
Net income/(loss) for the period				40,711,896	40,711,896
Restricted share award issuances	$ 1,832		(1,832)
Restricted share award issuances (in shares)	183,220
Stock-based compensation			890,700		890,700
Purchase of treasury stock		(6,310,514)			(6,310,514)
Balance at Sep. 30, 2019	$ 590,736	(43,778,657)	865,778,309	131,781,556	954,371,944
Balance (in shares) at Sep. 30, 2019	59,073,485
Increase (Decrease) in Shareholders' Equity
Net income/(loss) for the period				35,628,912	35,628,912
Restricted share award issuances	$ 47		(47)
Restricted share award issuances (in shares)	4,745
Stock-based compensation			651,506		651,506
Purchase of treasury stock		(8,627,586)			(8,627,586)
Balance at Dec. 31, 2019	$ 590,783	$ (52,406,243)	$ 866,429,768	$ 167,410,468	$ 982,024,776
Balance (in shares) at Dec. 31, 2019	59,078,230

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