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STOCK COMPENSATION EXPENSE (Tables)
12 Months Ended
Dec. 31, 2012
STOCK COMPENSATION EXPENSE [Abstract]  
Assumption Used in the Black-Scholes Option-pricing Model
On March 21, 2012, 105,700 incentive stock options were granted out of the 2002 Employee Stock Option Plan at an exercise price of $7.47, the closing market price of Premier on the grant date.  These options vest in three equal annual installments ending on March 21, 2015.  On March 16, 2011, 102,000 incentive stock options were granted out of the 2002 Employee Stock Option Plan at an exercise price of $6.95, the closing market price of Premier on the grant date.  These options vest in three equal annual installments ending on March 16, 2014.  On March 17, 2010, 47,700 incentive stock options were granted out of the 2002 Plan at an exercise price of $8.90.  These options vest in three equal annual installments ending on March 17, 2013.
The fair value of the Company's employee stock options granted is estimated at the date of grant using the Black-Scholes option-pricing model. This model requires the input of highly subjective assumptions, changes to which can materially affect the fair value estimate. Additionally, there may be other factors that would otherwise have a significant effect on the value of employee stock options granted but are not considered by the model. The assumptions used in the Black-Scholes option-pricing model are as follows

   
2012
  
2011
  
2010
 
Risk-free interest rate
  2.31%  3.58%  3.65%
Expected option life (yrs)
  10.00   10.00   10.00 
Expected stock price volatility
  34.93%  30.01%  24.67%
Dividend yield
  2.68%  4.03%  4.94%
Weighted average fair value of options granted during the year
 $2.34  $1.63  $1.41 

Summary of Stock Option Activity
During the year ending December 31, 2012, 25,550 options were exercised while no options were exercised during the years ending December 31, 2011 and December 31, 2010.
A summary of the Company's stock option activity is as follows:

 
   ----------2012----------  ----------2011----------   ----------2010---------- 
   
Options
  
Weighted
Average
Exercise
Price
  
Options
  
Weighted
Average
Exercise
Price
  
Options
  
Weighted
Average
Exercise
Price
 
Outstanding at beginning of year
  350,949  $9.69   255,649  $10.77   212,449  $11.18 
Grants
  105,700   7.47   102,000   6.95   47,700   8.90 
Exercises
  (25,550)  7.52   -   -   -   - 
Forfeitures or expired
  (38,733)  9.61   (6,700)  9.10   (4,500)  10.47 
Outstanding at year-end
  392,366  $9.24   350,949  $9.69   255,649  $10.77 
                          
Exercisable at year-end
  220,646  $10.68   206,727  $11.36   165,699  $11.89 
Weighted average remaining life
  6.6       6.4       6.3     
                          

Stock Option Activity by Range of Exercise Prices
Additional information regarding stock options outstanding and exercisable at December 31, 2012 is provided in the following table:

   
- - - - - - - - Outstanding - - - - - - - -
  
- - - - - - - - Currently Exercisable - - - - - - - -
 
Range of Exercise Prices
  
Number
  
Weighted Average Exercise Price
  
Aggregate Intrinsic Value
  
Number
  
Weighted Average Remaining Contractual Life
  
Weighted Average Exercise Price
  
Aggregate Intrinsic Value
 
                       
$6.50 to $10.00   280,433  $7.48  $945   108,713   6.1  $7.62  $351 
$10.01 to $12.50   23,333   11.62   -   23,333   2.1   11.62   - 
$12.51 to $15.00   63,600   13.46   -   63,600   4.7   13.46   - 
$15.01 to $17.50   25,000   16.00   -   25,000   3.1   16.00   - 
Outstanding at Dec 31, 2012
   392,366   9.24  $945   220,646   4.9   10.68  $351