Stockholders' Equity (Details Textual) - USD ($)		12 Months Ended
	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014	Nov. 06, 2012
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program Expiration Date	Dec. 31, 2016
Preferred stock shares authorized		5,000,000.0	5,000,000.0
Preferred stock shares issued		0	0
Preferred stock shares outstanding		0	0
Annual maximum purchases authorized under stock buyback program		$ 25,000,000
Purchase of common stock on stock buyback program		654,958	283,772		2,653,399
Payments for Repurchase of Common Stock		$ (10,461,000)	$ (5,000,000)	$ 0
Common stock shares withheld		205,504	105,058
Treasury stock, shares		1,591,072	1,447,394