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Note 5 - Stock-based Compensation; Changes in Equity (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Share-based Payment Arrangement, Activity [Table Text Block]
   
Shares under Option
    
Weighted Average Exercise Price
  
Balance at December 31, 2018
    
471,144
     $
3.95
  
Granted
    
-
      
-
  
Cancelled/Expired
    
-
      
-
  
Exercised/Issued
    
-
      
-
  
Outstanding at September 30, 2019
    
471,144
     $
3.95
  
                 
Exercisable at September 30, 2019
    
165,264
     $
4.05