Quarterly Results of Operations (Details Textual) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effect of Fourth Quarter Events [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 1,936,000	$ 0	$ 0	$ 0	$ 2,033,000	$ 0	$ 0	$ 0	$ 1,936,000	$ 2,033,000	$ 0
Gain (Loss) on Disposition of Intangible Assets	$ 1,210,000