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Note 10 - Per Share Data (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2020

  

2019

  

2020

  

2019

 

Net income/(loss) for basic earnings per share

 $20,890,158  $(3,162,492) $11,992,629  $(1,532,715)

Less: Change in fair value of warrants

     656,523      3,792,788 

Net income/(loss), adjusted for change in fair value of warrants for diluted earnings per share

 $20,890,158  $(3,819,015) $11,992,629  $(5,325,503)

Weighted-average shares

  80,340,695   80,986,524   80,790,400   80,950,124 

Effect of potential common shares

  176,168   1,128,137   169,412   1,179,477 

Weighted-average shares: diluted

  80,516,863   82,114,661   80,959,812   82,129,601 

Income/(loss) per share: basic

 $0.26  $(0.04) $0.15  $(0.02)

Income/(loss) per share: diluted

 $0.26  $(0.05) $0.15  $(0.06)
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

  

2019

 

Stock options

  352,015   364,444 

Stock-settled stock appreciation rights

     3,359 

Restricted stock units

  527,082   518,295