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Note 4 - Revenue Recognition (Tables)
 6 Months Ended
Mar. 31, 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
   $
5,063,091
     $
1,059,407
     $
6,122,498
  
New performance obligations
    
2,302,269
      
285,555
      
2,587,824
  
Recognition of revenue as a result of satisfying performance obligations
    
(4,099,364
 )    
(450,643
 )    
(4,550,007
 )
Effect of exchange rate on deferred revenue
    
-
      
5,523
      
5,523
  
Balance at March 31, 2020
   $
3,265,996
     $
899,842
     $
4,165,838
  
Less: non-current portion
    
-
      
(435,880
 )    
(435,880
 )
Current portion at March 31, 2020
   $
3,265,996
     $
463,962
     $
3,729,958