Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2014

Equity [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

The following table represents stock options activity for the year ended December 31, 2014:

	Number of Shares	Weighted Average Exercise Price		Average Remaining Contractual Term	Aggregate Intrinsic Value
Options outstanding at January 1, 2014	15,000	$	16.88	2.0 years	$	107,475
Options granted	—	—		—	—
Options exercised	—	—		—	—
Options forfeited or expired	—	—		—	—
Options outstanding at December 31, 2014	15,000	$	16.88	1.0 year	$	—
Options exercisable at December 31, 2014	15,000	$	16.88	1.0 year	$	214,575

Nonvested Stock Activity

The following table represents the nonvested stock activity for the year ended December 31, 2014:

	Number of Shares		Weighted Average Grant Date Fair Value
Nonvested shares outstanding at January 1, 2014	506,467		$	22.08
Granted	199,445		23.59
Vested	(180,115	)	22.05
Forfeited	(1,510	)	23.38
Nonvested shares outstanding at December 31, 2014	524,287		$	22.56

Summary of Shares Issued Under Employee Stock Purchase Plan

The following table represents the shares issued during 2014, 2013 and 2012 under the Employee Stock Purchase Plan:

	Number of Shares	Weighted Average Per Share Price
Shares available as of January 1, 2011	111,432
Additional shares authorized for issuance	250,000
Shares issued in 2012	50,185	$	15.58
Shares issued in 2013	38,459	$	20.39
Shares issued in 2014	36,305	$	21.49
Shares available as of December 31, 2014	236,483