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Note 9 - Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
2016
   
2015
 
Weighted average common shares outstanding basic earnings per share
   
6,285,815
     
6,175,254
 
                 
Effect of potential common share issuance:
               
Stock options
   
---
     
108,053
 
                 
Weighted average common shares outstanding
               
Diluted earnings per share
   
6,285,815
     
6,283,307