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Note 3 - Stockholders' Equity (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
   
Six Months Ended
 
   
June 30,
   
June 30,
 
   
2019
   
2018
   
2019
   
2018
 
                                 
Basic and diluted
   
19,180,735
     
19,091,414
     
19,163,022
     
19,074,809
 
Potentially dilutive
   
2,500
     
27,500
     
11,389
     
27,500