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Stock option plans
 12 Months Ended
Dec. 31, 2011
Stock option plans [Abstract]  
Stock option plans
12.  Stock plans:

The Company has a stock option plan covering non-employee directors and a stock incentive plan for certain officers and key employees.  The Plan is administered by a committee of the Board of Directors.  Under the Plan, 187,500 shares of common stock are reserved for possible issuance.  The number of shares available is subject to future adjustment in the event of specified changes in the Company's capital structure.  Under the Plan, the exercise price cannot be less than 100% of the fair market value on the date of grant.  The vesting period of options granted is at the discretion of the Board of Directors.  There were 35,451 shares available for grant under this stock option plan as of December 31, 2011.

The activity under the plans for each of the years in the three-year period ended December 31, 2011, is summarized as follows:

   
2011
  
2010
  
2009
 
December 31
 
Options
  
Weighted Average Price
  
Options
  
Weighted Average Price
  
Options
  
Weighted Average Price
 
Outstanding, beginning of year
  21,574   23.34   27,449  $22.43   33,549  $21.78 
Granted
                        
Exercised
  (7,425)  16.71   (5,575)  18.50   (4,975)  17.10 
Forfeited
  (750)  30.78   (300)  30.78   (1,125)  26.63 
Outstanding, end of year
  13,399   26.59   21,574  $23.34   27,449  $22.43 
Exercisable, end of year
  13,399   26.59   21,574  $23.34   27,449  $22.43 

The weighted-average remaining contractual life of the options outstanding was approximately two years at December 31, 2011.  The weighted-average remaining contractual life of options exercisable at December 31, 2011 was approximately two years.  Stock options outstanding at December 31, 2011 are exercisable at prices ranging from $18.00 to $34.10 per share. The aggregate intrinsic value of options outstanding and exercisable was $22 at December 31, 2011 and $70 at December 31, 2010.  The aggregate intrinsic value of options exercised was $86, $45, and $2 for the years ended December 31, 2011, 2010, and 2009.

The Company offers its shareholders a Dividend Reinvestment and Stock Purchase Plan.  Under the Plan, the Company registered 100,000 shares of its common stock to be sold pursuant to this Plan.  The Plan provides shareholders with a simple and convenient method of purchasing additional common shares without payment of any brokerage commission or other service fees.  The Plan may purchase shares on the open market if available or they may be issued from treasury shares.  A participant in the Plan may elect to reinvest dividends on all or part of their shares to acquire additional common stock.  The Plan also permits shareholders to purchase additional shares of common stock through voluntary cash payments.  A participant may withdraw from the Plan at any time.  At  December 31, 2011, there are 35,451 remaining shares available for acquisition under the Plan.