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Note 7 - Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 
  

2021

  

2020

  

2021

  

2020

 

Basic weighted-average shares

  30,264,000   24,668,000   28,895,000   24,633,000 

Conversion of unsecured loan notes

            

Unexercised options and unvested RSUs

            

Diluted weighted-average shares

  30,264,000   24,668,000   28,895,000   24,633,000