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Note 3 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months Ended
 
   
March 31,
 
   
2019
   
2018
 
Basic and diluted
   
19,144,912
     
19,058,202
 
Potentially dilutive
   
19,775
     
27,500