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Stock Option Plans (Tables)

12 Months Ended

Dec. 31, 2014

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

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

For the years ended December 31, 2014, 2013, and 2012, the fair value of each option granted is estimated on the date of grant using the Black-Scholes option-pricing model with the following assumptions:

		Years Ended December 31,
		2014		2013		2012
Dividend yield		0.0	%	0.0	%	0.0	%
Expected life		8.5 years		7.0 years		7.0 years
Expected volatility		45.73	%	47.60	%	44.62	%
Risk-free interest rate		2.32	%	1.23	%	1.44	%

Board Of Directors Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]

An analysis of this stock option plan is presented in the following table:

		Years Ended December 31,
		2014									2013						2012
					Average			Aggregate						Average						Average
					Exercise			Intrinsic						Exercise						Exercise
		Shares			Price			Value(1)			Shares			Price			Shares			Price
Outstanding at beginning of year			190,250		$	3.07			145,250		$	3.30			55,250		$	5.98
Granted			80,000			2.40			45,000		$	2.37			90,000		$	1.65
Exercised			-			-			-			-			-			-
Forfeited			16,000			5.44			-			-			-			-
Outstanding at end of year			254,250		$	2.71		$	264,500			190,250		$	3.07			145,250		$	3.30
Options exercisable at year-end			151,750		$	2.93		$	170,550			100,250		$	4.03			55,250		$	5.98
Weighted-average fair value of options granted during the year		$	1.30								$	1.17					$	0.78

(1) The aggregate intrinsic value of a stock option in the table above represents the total pre-tax intrinsic value (the amount by which the current market value of the underlying stock exceeds the exercise price of the option) that would have been received by the option holders had all option holders exercised their options on December 31, 2014. This amount changes based on changes in the market value of Cornerstone's stock.

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

Information pertaining to options outstanding at December 31, 2014, is as follows:

					Options Outstanding					Options Exercisable
					Weighted		Weighted					Weighted
					Average		Average					Average
Exercise			Number		Remaining		Exercise			Number		Exercise
Prices			Outstanding		Life		Price			Exercisable		Price
$	9.23		8,000		0.2 Years		$	9.23		8,000		$	9.23
	7.99		12,800		3.2 Years			7.99		12,800			7.99
	3.60		18,450		4.2 Years			3.60		18,450			3.60
	2.40		80,000		9.2 Years			2.40		-			2.40
	2.37		45,000		8.2 Years			2.37		22,500			2.37
	1.65		90,000		7.2 Years			1.65		90,000			1.65
Outstanding at end of year			254,250		7.4 Years		$	2.71		151,750		$	2.93

Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested [Table Text Block]

Information pertaining to non-vested options for the year ended December 31, 2014, is as follows:

				Weighted Average
		Number		Grant Date
		of Shares		Fair Value
Non-vested options, December 31, 2013		90,000		$	0.98
Granted		80,000			1.30
Vested		(67,500)			0.91
Forfeited		-			-
Non-vested options, December 31, 2014		102,500		$	1.27

Officer and Employee Plans [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]

An analysis of the activity for each of the years ended December 31, 2014, 2013 and 2012, for this stock option plan follows:

		Years Ended December 31,
		2014									2013						2012
					Average			Aggregate						Average						Average
					Exercise			Intrinsic						Exercise						Exercise
		Shares			Price			Value(1)			Shares			Price			Shares			Price
Outstanding at beginning of year			810,825		$	3.51			670,300		$	3.86			572,600		$	4.63
Granted			207,000		$	2.40			203,000		$	2.37			202,000		$	1.65
Exercised			-			-			-			-			-			-
Forfeited			(77,990)		$	4.89			(62,475)		$	3.40			(104,300)		$	3.89
Outstanding at end of year			939,835		$	3.15		$	953,940			810,825		$	3.51			670,300		$	3.86
Options exercisable at year-end			345,735		$	4.88		$	264,144			307,025		$	6.10			274,680		$	6.82
Weighted-average fair value of options granted   during the year		$	1.30								$	1.17					$	0.78

(1) The aggregate intrinsic value of a stock option in the table above represents the total pre-tax intrinsic value (the amount by which the current market value of the underlying stock exceeds the exercise price of the option) that would have been received by the option holders had all option holders exercised their options on December 31, 2014. This amount changes based on changes in the market value of Cornerstone's stock.

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

Information pertaining to options outstanding at December 31, 2014, is as follows:

			Options Outstanding							Options Exercisable
					Weighted		Weighted					Weighted
					Average		Average					Average
Exercise			Number		Remaining		Exercise			Number		Exercise
Prices			Outstanding		Life		Price			Exercisable		Price
$	9.23		39,910		0.2 Years		$	9.23		39,910		$	9.23
	13.25		16,800		1.2 Years			13.25		16,800			13.25
	15.25		11,825		2.2 Years			15.25		11,825			15.25
	15.20		2,750		2.3 Years			15.20		2,750			15.20
	7.99		45,000		3.2 Years			7.99		45,000			7.99
	3.60		69,550		4.2 Years			3.60		69,550			3.60
	1.70		167,000		6.2 Years			1.70		100,200			1.70
	1.55		3,000		6.3 Years			1.55		1,800			1.55
	1.10		5,000		6.6 Years			1.10		3,000			1.10
	1.02		5,000		6.8 Years			1.02		3,000			1.02
	1.65		173,000		7.2 Years			1.65		51,900			1.65
	2.37		190,000		8.2 Years			2.37		-			-
	2.40		206,000		9.2 Years			2.40		-			-
	2.50		5,000		8.6 Years			2.50		-			-
Outstanding at end of year			939,835		6.8 Years		$	3.15		345,735		$	4.88

Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested [Table Text Block]

Information pertaining to non-vested options for the year ended December 31, 2014, is as follows:

				Weighted Average
		Number		Grant Date
		of Shares		Fair Value
Non-vested options, December 31, 2013		503,800		$	0.98
Granted		207,000			1.30
Vested		(107,400)			0.87
Forfeited		(9,300)			1.01
Non-vested options, December 31, 2014		594,100		$	1.11

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