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Note 6 - Net Loss Per Share (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months Ended June 30,
   
Six Months Ended June 30,
 
   
2019
   
2018
   
2019
   
2018
 
Anti-dilutive securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Stock options
   
2,628
     
-
     
2,628
     
-