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Note 7 - Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
 
   
March 31,
 
   
2021
   
2020
 
Basic weighted-average shares
   
27,510,000
     
24,597,000
 
Conversion of unsecured loan notes
   
     
 
Unexercised options and unvested RSUs
   
227,000
     
 
Diluted weighted-average shares
   
27,737,000
     
24,597,000