Significant Accounting Policies (AcctPro) (Details) - USD ($)	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle
Cash and cash equivalents	$ 34,947,580	$ 103,505,676
Restricted cash - non-current	35,635,252	25,862,704
Total cash, cash equivalents, and restricted cash	70,582,832	129,368,380	$ 84,716,249	$ 67,892,698
Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle
Cash and cash equivalents	34,947,580	103,505,676	55,633,291	17,018,552
Restricted cash - non-current	35,635,252	25,862,704	29,082,958	50,874,146
Total cash, cash equivalents, and restricted cash	$ 70,582,832	$ 129,368,380	$ 84,716,249	$ 67,892,698