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Note 9 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
2015
    
2014
  
Weighted average common shares outstanding
basic earnings per share
     6,175,254       6,129,831  
                 
Effect of potential common share issuance:
                
Stock options
     108,053       ---  
                 
Weighted average common shares outstanding
                
Diluted earnings per share
     6,283,307       6,129,831