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Note 3 - Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares [Table Text Block]
   

For the Three

    

For the Nine

  
   

Months Ended

    

Months Ended

  
   

September 30,

    

September 30,

  
   

2015

    

2014

    

2015

    

2014

  

Weighted-average common shares outstanding

     2,253,584       2,233,654       2,248,468       2,228,502  
                                 

Average treasury stock shares

     (189,530 )     (189,530 )     (189,530 )     (189,530 )
                                 

Weighted-average common shares and common stock equivalents used to calculate basic earnings per share

     2,064,054       2,044,124       2,058,938       2,038,972  
                                 

Additional common stock equivalents (stock options) used to calculate diluted earnings per share

     8,585       7,888       9,254       6,688  
                                 

Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share

     2,072,639       2,052,012       2,068,192       2,045,660