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Note 8 - (Loss) Income per Common Share (Tables)
 12 Months Ended
Dec. 31, 2023
Notes To Financial Statements [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    
Year ended December 31,
  
    
2023
     
2022
     
2021
  
Numerator
         
Net (loss) income
    $ (84,217 )     $ (37,348 )     $ 35,095  
Preferred stock dividends
      (552 )       (552 )       (552 ) 
  
 
 
     
 
 
     
 
 
  
Net (loss) income applicable to common stockholders
    $ (84,769 )     $ (37,900 )     $ 34,543  
  
 
 
     
 
 
     
 
 
  
Denominator
         
Basic weighted average common shares
      605,668        557,344        536,192  
Dilutive stock options, restricted stock units, and warrants
      —         —         5,984  
  
 
 
     
 
 
     
 
 
  
Diluted weighted average common shares
      605,668        557,344        542,176  
  
 
 
     
 
 
     
 
 
  
Basic (loss) income per common share
   
$
(0.14
) 
   
$
(0.07
) 
   
$
0.06
 
Diluted (loss) income per common share
   
$
(0.14
) 
   
$
(0.07
) 
   
$
0.06