Common Stock (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2009
Common Stock [Line Items]
Common stock, shares outstanding	16,747,926
Repurchases of common stock in the open market	$ 4,302,000	$ 7,959,000	$ 12,347,000
Shares sold in private placement				2,857,143
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01		$ 0.01
Securities purchase agreement purchase price				$ 20,000,000
Beneficial ownership maximum percentage				23.00%
Purchase price percentage	1.00%
Shareholders indemnification amount	$ 25,000
Sagard [Member]
Common Stock [Line Items]
Share price (in dollars per share)				$ 7.00
Stock beneficially owned	3,639,367
Stock beneficial ownership percentage	21.70%
Maximum [Member]
Common Stock [Line Items]
Liquidated damages amount	$ 2,400,000
Stock Repurchase Program [Member]
Common Stock [Line Items]
Stock repurchased during period (shares)	182,000	340,000	477,000
Repurchases of common stock in the open market	$ 4,300,000	$ 8,000,000	$ 12,300,000
Remaining authorized repurchase amount	$ 11,700,000
Equity Compensation Award [Member]
Common Stock [Line Items]
Shares reserved for future issuance	340,302
2011 Plan [Member]
Common Stock [Line Items]
Shares reserved for future issuance	605,788