Significant Accounting Policies (AcctPro) (Details) - USD ($)	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle
Cash and cash equivalents	$ 48,244,169	$ 103,505,676
Restricted cash - non-current	35,636,008	25,862,704
Total cash, cash equivalents, and restricted cash	83,880,177	129,368,380	$ 68,926,757	$ 67,892,698
Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle
Cash and cash equivalents	48,244,169	103,505,676	50,844,921	17,018,552
Restricted cash - non-current	35,636,008	25,862,704	18,081,836	50,874,146
Total cash, cash equivalents, and restricted cash	$ 83,880,177	$ 129,368,380	$ 68,926,757	$ 67,892,698