Stock Repurchase Program (Details) - USD ($)			2 Months Ended		12 Months Ended			24 Months Ended
	Apr. 12, 2016	Mar. 09, 2016	Sep. 30, 2016	Feb. 29, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Nov. 01, 2016	Aug. 02, 2016	Mar. 10, 2016
Shares repurchased, authorized amount						$ 13,500,000	$ 13,500,000	$ 13,500,000	$ 10,000,000	$ 6,000,000
Shares repurchased, increased authorized amount										$ 4,000,000
Share price (in dollars per share)					$ 4.08	$ 3.05		$ 3.05
Repurchase of common stock paid					$ 23,843,474	$ 7,060,409	$ 822,603
Common stock repurchased (in shares)		1.3	1.6	1.3				3.6
Stock repurchased, aggregate price		$ 3,600,000	$ 6,000,000	$ 3,600,000				$ 7,900,000
Remaining shares available for purchase, value		$ 2,000,000
Modified "Dutch auction" tender offer
Shares repurchased, authorized amount											$ 15,000,000
Repurchase of common stock paid	$ 14,200,000
Common stock repurchased (in shares)	3.9
Share price	$ 3.60
Modified "Dutch auction" tender offer | Maximum
Share price											$ 3.60
Modified "Dutch auction" tender offer | Minimum
Share price											$ 3.20