Income Taxes (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
Income Tax [Line Items]
Deferred Tax Assets Tax Deferred Compensation Noncurrent	$ 2,082,000				$ 2,089,000				$ 2,082,000	$ 2,089,000
Income Tax Expense (Benefit)	3,050,000	2,180,000	3,193,000	1,627,000	2,230,000	2,820,000	3,130,000	1,812,000	10,050,000	9,992,000	11,939,000
Income Tax Examination, Penalties and Interest Accrued	$ 0				$ 0				$ 0	$ 0