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Note 4 - Revenue Recognition (Tables)
 3 Months Ended
Dec. 31, 2019
Notes Tables  
Contract with Customer, Asset and Liability [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
    
1,473,433
      
30,424
      
1,503,857
  
Recognition of revenue as a result of satisfying performance obligations
    
(2,089,763
 )    
(238,919
 )    
(2,328,682
 )
Effect of exchange rate on deferred revenue
    
-
      
9,136
      
9,136
  
Balance at December 31, 2019
   $
4,446,761
     $
860,048
     $
5,306,809
  
Less: non-current portion
    
-
      
(490,795
 )    
(490,795
 )
Current portion at December 31, 2019
   $
4,446,761
     $
369,253
     $
4,816,014