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Note 12 - Leases (Tables)
 12 Months Ended
Sep. 30, 2020
Notes Tables  
Initial Measurement of Operating Lease [Table Text Block]
   
Operating right-of-
use asset
 
Initial measurement at October 1, 2019
   $
7,815
  
Less lease incentives and tenant improvement allowance
    
(1,991
 )
Net operating lease right of use assets at October 1, 2019
    
5,824
  
Additional operating lease right of use assets
    
44
  
Less amortization of operating lease right-of-use assets
    
(599
 )
Effect of exchange rate on operating lease right of use assets
    
16
  
Operating lease right of use asset at September 30, 2020
   $
5,285
  
   
Operating lease
liabilities
 
Initial measurement at October 1, 2019
   $
7,815
  
Additional operating lease liabilities
    
44
  
Less lease principal payments on operating lease liabilities
    
(709
 )
Effect of exchange rate on operating lease liabilities
    
16
  
Operating lease liabilities at September 30, 2020
    
7,166
  
Less non-current portion
    
(6,395
 )
Current portion at September 30, 2020
   $
771
  
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Fiscal year ending September 30,
        
2021
   $
1,047
  
2022
    
1,074
  
2023
    
1,022
  
2024
    
1,018
  
2025
    
1,145
  
Thereafter
    
3,104
  
Total undiscounted operating lease payments
    
8,410
  
Less imputed interest
    
(1,244
 )
Present value of operating lease liabilities
    
7,166
  
Less lease liability, noncurrent
    
(6,395
 )
Lease liability, current portion
   $
771