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Note 12 - Net Loss Per Share (Tables)
 6 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
(in thousands, except per share data)
  
March 31,
    
March 31,
  
   
2019
    
2018
    
2019
    
2018
  
Net loss
   $
(12,522
 )   $
(680
 )   $
(17,477
 )   $
(1,110
 )
Accrued dividends on convertible preferred stock
    
(78
 )    
(77
 )    
(157
 )    
(152
 )
Net loss applicable to common shareholders
   $
(12,600
 )   $
(757
 )   $
(17,634
 )   $
(1,262
 )
                                 
Weighted average common shares outstanding - basic and diluted
    
303
      
85
      
262
      
84
  
                                 
Net loss per share attributable to common shareholders:
                                
Basic and diluted
   $
(41.52
 )   $
(8.95
 )   $
(67.36
 )   $
(14.98
 )