Stock-Based Awards (Details 1) (Stock Incentive Plan 2006 [Member], USD $)	0 Months Ended	1 Months Ended		12 Months Ended
	May 08, 2014	May 23, 2013	May 22, 2012	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Available for grant				146,885
Stock Unit Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Unvested				138,975		137,475		119,100
Number of Shares, Granted	44,575	56,500	65,000	44,575		56,500		65,000
Number of Shares, Converted to common stock				(61,925)	[1]	(50,350)	[1]	(46,625)	[1]
Number of Shares, Cancelled				0		(4,650)		0
Number of Shares, Unvested				121,625		138,975		137,475
Number of Shares, Available for grant				146,885
Weighted Average Remaining Contractual Life, Outstanding & Unvested				2 years 8 months 12 days
Aggregate Intrinsic Value, Unvested				$ 1,842,619	[2]	$ 2,041,543	[2]	$ 1,477,856	[2]	$ 1,083,810	[2]
Aggregate Intrinsic Value, Converted to common stock				$ 922,330	[1],[2]	$ 577,321	[1],[2]	$ 458,211	[1],[2]

[1] Includes 9,879 shares in 2014, 13,362 shares in 2013, 9,619 shares in 2012, and 8,406 shares in 2011 withheld to cover income taxes.

[2] The aggregate intrinsic value on this table was calculated based on the closing market price of the Company’s stock. The price at year end was $15.15, $14.69, $10.75, and $9.10 for the years ended December 31, 2014, 2013, 2012 and 2011, respectively. For value on the converted stock, the price used is the price on the grant date.