FBR Sales Agreement (Details Textual) - Fbr Capital Markets Co [Member] - USD ($)		1 Months Ended	3 Months Ended	6 Months Ended
	Aug. 05, 2016	Jul. 31, 2017	Jun. 30, 2017	Jun. 30, 2017
Federal Board Revenue Sales Agreement [Line Items]
Stock Issued During Period, Value, New Issues	$ 40,000,000
Brokerage Commission percentage	3.00%
Stock Issued During Period, Shares, New Issues			9,800,000	10,100,000
Proceeds from Issuance of Common Stock			$ 5,600,000	$ 5,900,000
Subsequent Event [Member]
Federal Board Revenue Sales Agreement [Line Items]
Stock Issued During Period, Shares, New Issues		338,000
Proceeds from Issuance of Common Stock		$ 175,000