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Stock Option Plans (Tables) | 12 Months Ended
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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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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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