Stock Options and Warrants - Rights and Warrants (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Aug. 19, 2009	Dec. 31, 2015	Dec. 31, 2016	Feb. 17, 2016
Class of Warrant or Right [Line Items]
Number of securities declined to exercise (in shares)		204,706
Number of shares that may be purchased by warrants (shares)		83,334
Exercise price of right (usd per right)		$ 30.00	$ 30
Proceeds from warrant exercises		$ 2.5
Class of warrant or right, outstanding (in shares)			133,000
Option Matching Rights [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Number of Securities Exercised to Trigger Option Matching Rights	200,000
Class of Warrant or Right, Option Exercise Notice	5 years
Class of Warrant or Right, Option Exercise, Second Notice	10 days
Number of securities declined to exercise (in shares)				204,706
Class of Warrant or Right, Option Cancellation Notice	10 years
Class of warrant or right, outstanding (in shares)			21,000