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Note 3 - Shares - Basic and Diluted (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months Ended March 31,
 
   
(unaudited)
 
   
2020
   
2019
 
                 
Basic and diluted
   
19,254,783
     
19,144,912
 
Potentially dilutive
   
-
     
19,775