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Note 5 - Net Gain (Loss) Per Share (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 
  

2020

  

2019

  

2020

  

2019

 

Anti-dilutive securities:

                

Stock options

  211   2,637   2,334   2,637