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Shareholders' Equity
 3 Months Ended
Mar. 31, 2012
Shareholders' Equity  
Shareholders' Equity Note Disclosure [Text Block]

6.  Shareholders’ Equity

 

The following table summarizes the change in shareholders’ equity during the three months ended March 31, 2012 and 2011, respectively:

 

 

Three months ended March 31,

 

2012

2011

Balance at the beginning of the period

 

   $     39,664

   $     31,735

Net income during the period

 

                453

                812

Stock based compensation

 

                  51

                  39

Exercise of stock options

 

                      -

                  21

Balance at end of the period

 

   $     40,168

   $     32,607