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Stock Option Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

For the years ended December 31, 2012 and 2011, 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, 
  2012  2011 
       
Dividend yield  0.0%  0.0%
Expected life  7.0 years   7.0 years 
Expected volatility  44.62%  43.11%
Risk-free interest rate  1.44%  2.81%
Board Of Directors Plan [Member]
  
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, 
  2012  2011  2010 
     Average  Aggregate     Average     Average 
     Exercise  Intrinsic     Exercise     Exercise 
  Shares  Price  Value(1)  Shares  Price  Shares  Price 
                      
Outstanding at beginning of year  55,250  $5.98     100,250   $9.42  100,250  $ 9.42  
                             
Granted  90,000  $1.65      -   -   -   -  
                             
Exercised  -   -      -   -   -   -  
                             
Forfeited  -   -     45,000  $ 13.65   -   -  
                             
Outstanding at end of year  145,250  $3.30  $57,600   55,250  $5.98   100,250  $9.42 
                             
Options exercisable at year-end  55,250  $5.98  $-   55,250  $5.98   91,025  $10.01 
                             
Weighted-average fair value of options granted during the year $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, 2012. 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, 2012, 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 
                
$5.44   16,000  1.2 Years $5.44   16,000  $5.44 
 9.23   8,000  2.2 Years  9.23   8,000   9.23 
 7.99   12,800  5.2 Years  7.99   12,800   7.99 
 3.60   18,450  6.2 Years  3.60   18,450   3.60 
 1.65   90,000  9.2 Years  1.65   -   - 
                     
Outstanding at end of year   145,250  7.2 Years $3.30   55,250  $5.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block]

Information pertaining to non-vested options for the year ended December 31, 2012, is as follows:

 

     Weighted Average 
  Number  Grant Date 
  of Shares  Fair Value 
       
Non-vested options, December 31, 2011  -  $- 
Granted  90,000   1.65 
Vested  -   - 
Forfeited  -   - 
         
Non-vested options, December 31, 2012  90,000  $1.65
Officer and Employee Plans [Member]
  
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 ending December 31, 2012, 2011 and 2010, for this stock option plan follows:

 

  Years Ended December 31, 
  2012  2011  2010 
     Average  Aggregate     Average     Average 
     Exercise  Intrinsic     Exercise     Exercise 
  Shares  Price  Value(1)  Shares  Price  Shares  Price 
                      
Outstanding at beginning of year  572,600  $4.63       520,900  $5.79   799,675  $6.18 
                             
Granted  202,000  $1.65       221,000  $1.67   -   - 
                             
Exercised  -   -       -   -   -   - 
                             
Forfeited  (104,300) $3.89       (169,300) $4.31   (278,775) $6.90 
                             
Outstanding at end of year  670,300  $3.86  $232,900   572,600  $4.63   520,900  $5.79 
                             
Options exercisable at year-end  274,680  $6.82  $-   295,415  $6.67   385,270  $5.88 
                             
Weighted-average fair value of options granted during the year $0.78          $0.95      $-     

  

(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, 2012. 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, 2012, 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 
                 
$3.63   49,000   0.2 Years  $3.63   49,000  $3.63 
 5.44   65,640   1.2 Years   5.44   65,640   5.44 
 9.23   39,910   2.2 Years   9.23   39,910   9.23 
 13.25   17,000   3.2 Years   13.25   17,000   13.25 
 15.25   11,950   4.2 Years   15.25   11,950   15.25 
 15.20   2,750   4.3 Years   15.20   2,750   15.20 
 7.99   45,500   5.2 Years   7.99   45,500   7.99 
 3.60   71,550   6.2 Years   3.60   42,930   3.60 
 1.70   174,000   8.2 Years   1.70   -   - 
 1.55   3,000   8.3 Years   1.55   -   - 
 1.10   5,000   8.6 Years   1.10   -   - 
 1.02   5,000   8.8 Years   1.02   -   - 
 1.65   180,000   9.2 Years   1.65   -   - 
                       
Outstanding at end of year   670,300   6.2 Years  $3.86   274,680  $6.82
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block]

Information pertaining to non-vested options for the year ended December 31, 2012, is as follows:

 

     Weighted Average 
  Number  Grant Date 
  of Shares  Fair Value 
       
Non-vested options, December 31, 2011  277,185  $2.47 
Granted  202,000   1.65 
Vested  (39,665)  5.61 
Forfeited  (43,900)  1.79 
         
Non-vested options, December 31, 2012  395,620  $1.80