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Note 3 - Earnings (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended September 30,
    
Nine months ended September 30,
  
   
2019
    
2018
    
2019
    
2018
  
Numerator:
                                
Net loss
   $
(1,976
)
   $
(10,142
)
   $
(6,423
)
   $
(14,151
)
Denominator:
                                
Basic weighted average shares outstanding
    
16,646,323
      
8,306,707
      
16,635,954
      
8,304,974
  
Dilutive common stock equivalents using treasury stock method
    
—
      
—
      
—
      
—
  
Diluted weighted average shares outstanding
    
16,646,323
      
8,306,707
      
16,635,954
      
8,304,974
  
                                 
Basic loss per common share
   $
(0.12
)
   $
(1.22
)
   $
(0.39
)
   $
(1.70
)
Diluted loss per common share
   $
(0.12
)
   $
(1.22
)
   $
(0.39
)
   $
(1.70
)
                                 
Weighted average options outstanding
    
561,634
      
711,888
      
572,845
      
727,980
  
Anti-dilutive options not included in the computations
    
561,634
      
711,888
      
572,845
      
727,980