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Note 10 - Segment Information (Tables)
 12 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
   
Revenues
    
 
  
   
Years Ended
    
Long-Lived Assets
  
   
September 30,
    
September 30,
  
   
2020
    
2019
    
2020
    
2019
  
United States
   $
18,714
     $
19,680
     $
3,412
     $
1,778
  
Europe and Middle East
    
7,245
      
5,718
      
1,447
      
475
  
Asia
    
7,714
      
7,822
      
1,449
      
1,307
  
Other
    
1,080
      
1,561
      
—
      
—
  
Total
   $
34,753
     $
34,781
     $
6,308
     $
3,560