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Note 4 - Revenue Recognition (Tables)
 6 Months Ended
Mar. 31, 2019
Notes Tables  
Contract with Customer, Asset and Liability [Table Text Block]
   
Prepaid maintenance
  
   
agreement
  
Balance at September 30, 2018
   $
93,750
  
New prepaid maintenance agreements
    
-
  
Recognition of expense as a result of performing services
    
(93,750
 )
Balance at March 31, 2019
   $
-
  
   
Customer
deposits
    
Deferred
revenue
    
Total contract
liabilities
 
Balance at September 30, 2018
   $
199,596
     $
523,021
     $
736,054
  
New performance obligations
    
951,719
      
601,313
      
1,553,032
  
Recognition of revenue as a result of satisfying performance obligations
    
(418,798
 )    
(521,434
 )    
(940,232
 )
Balance at March 31, 2019
   $
732,517
     $
602,900
     $
1,348,854
  
Less: non-current portion
    
-
      
(146,043
 )    
(146,043
 )
Current portion at March 31, 2019
   $
732,517
     $
456,857
     $
1,202,811