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Note 7 - Stock Options
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Note 7 – Stock Options

A summary of options issued, exercised and cancelled are as follows:

 
  
Shares
    
Weighted- Average
Exercise Price ($)
    
Weighted- Average
Remaining
Contractual Term
    
Aggregate Intrinsic
Value ($)
  
Outstanding at December 31, 2017
    
67,879
    
$
21.40
      
5.17
      
—
  
Granted
    
—
      
—
      
—
      
—
  
Cancelled
    
—
      
—
      
—
      
—
  
 
                                
Outstanding at March 31, 2018
    
67,879
    
$
21.40
      
4.92
      
—
  
 
                                
Exercisable at March 31, 2018
    
67,879
    
$
21.40
      
4.92
      
—