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Note 3 - Stock-based Compensation; Changes in Equity (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Share-based Compensation, Activity [Table Text Block]
   
Shares
under
Option
   
Weighted
Average
Exercise
Price
 
Balance at December 31, 2017
   
476,144
    $
3.97
 
Granted
   
-
     
-
 
Cancelled/Expired
   
-
     
-
 
Exercised/Issued
   
(5,000
)    
-
 
Outstanding at March 31, 2018
   
471,144
    $
4.01
 
                 
Exercisable at March 31, 2018
   
103,463
    $
5.38