Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The fair value of stock option payment awards was estimated using the Black-Scholes option pricing model with the following assumptions and weighted average fair values:

	2015		2014		2013
Weighted average fair value of grants	$	-	$	-	$	2.50-2.87
Risk-free interest rate		-%		-%		1.86-2.29%
Dividend yield		-%		-%		1.76-2.11%
Expected volatility		-%		-%		23.21-33.74%
Expected life in months				-		69-90

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

Option activity under the principal option plans as of December 31, 2015 and changes during the twelve months ended December 31, 2015 were as follows:

				Weighted-
				Average
		Weighted-		Remaining
		Average		Contractual
		Exercise		Term	Aggregate
	Shares	Price		(In Years)	Intrinsic Value
Outstanding at December 31, 2014	882,657	$	5.65
Granted	-		-
Exercised	(340,492)		4.19
Forfeited/cancelled/expired	(6,259)		5.60
Outstanding at December 31, 2015	535,906	$	6.48	3.16	$	6,541,740
Exercisable at December 31, 2015	532,376	$	6.43	3.13	$	6,526,031

Schedule of Share Based Compensation Stock Option Plan Table Text Block

Information related to the stock option plan during 2015:

	2015
Intrinsic value of options exercised	$	5,218,993
Cash received from options exercised		1,424,814
Tax benefit realized from options exercised		341,000
Weighted average fair value of options granted		-

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

The below table represents information regarding restricted shares currently outstanding at December 31, 2015:

		Weighted-
		Average
	Nonvested	Grant Date
	Shares	Fair Value
Nonvested at December 31, 2014	50,303	$	11.79
Granted	69,258		18.13
Vested	(19,061)		11.53
Forfeited/cancelled/expired	(3,598)		18.43
Nonvested at December 31, 2015	96,902	$	16.81

Schedule of Unearned Performance Unit Awards [Table Text Block]

A summary of the status of unearned performance unit awards and the change during the period is presented in the table below:

		Weighted-
		Average
		Grant Date
	Shares	Fair Value
Unearned at December 31, 2014	-	$	-
Awarded	94,585		19.46
Forfeited	-		-
Expired	-		-
Unearned at December 31, 2015	94,585	$	19.46