Significant Accounting Policies (AcctPro) (Details) - USD ($)	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents	$ 65,291,784	$ 103,505,676
Restricted cash - non-current	35,636,500	25,862,704
Total cash, cash equivalents, and restricted cash	100,928,284	129,368,380	$ 53,438,191	$ 67,892,698
Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents	65,291,784	103,505,676	35,363,045	17,018,552
Restricted cash - non-current	35,636,500	25,862,704	18,075,146	50,874,146
Total cash, cash equivalents, and restricted cash	$ 100,928,284	$ 129,368,380	$ 53,438,191	$ 67,892,698