Stockholders' Equity - Common and Preferred Shares Authorized (Details) - $ / shares	Apr. 30, 2017	May 13, 2016	Apr. 30, 2016
Stockholders' Equity
Common stock, shares authorized	500,000,000	500,000,000	500,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, shares outstanding	40,970,905		32,892,905
Preferred stock, shares authorized	50,000,000	50,000,000	50,000,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares outstanding	0		0