Common Stock (SBC) (Details) - USD ($)	12 Months Ended			17 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Aug. 31, 2015
Stock repurchases
Authorized amount					$ 100,000,000
Treasury stock shares acquired (in shares)				3,342,035
Treasury stock value acquired	$ 1,326,159	$ 12,953,453	$ 20,943,816	$ 33,700,000