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Note 4 - Revenue Recognition (Tables)
 12 Months Ended
Sep. 30, 2020
Notes Tables  
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
   
Customer
deposits
    
Deferred
revenue
    
Total contract
liabilities
 
Balance at September 30, 2019
   $
5,063
     $
1,060
     $
6,123
  
New performance obligations
    
7,089
      
962
      
8,051
  
Recognition of revenue as a result of satisfying performance obligations
    
(8,469
 )    
(1,022
 )    
(9,491
 )
Effect of exchange rate on deferred revenue
    
-
      
24
      
24
  
Balance at September 30, 2020
   $
3,683
     $
1,024
     $
4,707
  
Less: non-current portion
    
-
      
(293
 )    
(293
 )
Current portion at September 30, 2020
   $
3,683
     $
731
     $
4,414