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Note 11 - Net Income (Loss) Per Share (Tables)
 9 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
(in thousands, except per share data)
  
June 30,
    
June 30,
  
   
2019
    
2018
    
2019
    
2018
  
Numerator:
                                
Net income/(loss)
   $
7,311
     $
(5,162
 )   $
(10,166
 )   $
(6,272
 )
Change in warrant derivative liability    
(18
 )    
-
      
(18
 )    
-
  
Accrued dividends on convertible preferred stock
    
(78
 )    
(79
 )    
(235
 )    
(231
 )
Net income/(loss) applicable to common shareholders
   $
7,215
     $
(5,241
 )   $
(10,419
 )   $
(6,503
 )
Denominator:
                                
Weighted average shares outstanding for basic earnings per share 
    
1,996
      
85
      
840
      
84
  
    Effect of dilutive securities:                                
        Warrants
    
1
      
-
      
1
      
-
  
         Preferred stock    
36
      
-
      
-
      
-
  
Adjusted weighted-average shares outstanding and assumed conversions for diluted earnings per share    
2,033
      
85
      
841
      
84
  
                                 
Basic net income/(loss) per share
   $
3.62
     $
(61.78
 )   $
(12.38
 )   $
(77.00
 )
   
Diluted net income/(loss) per share
   $
3.56
     $
(61.78
 )   $
(12.38
 )   $
(77.00
 )