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Note 4 - Revenue Recognition (Tables)
 3 Months Ended
Dec. 31, 2018
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
    
(46,875
 )
Balance at December 31, 2018
   $
46,875
  
Less: non-current portion
    
-
  
Current portion at December 31, 2018
   $
46,875
  
   
Customer
deposits
    
Deferred
revenue
    
Total contract
liabilities
 
Balance at September 30, 2018
   $
199,596
     $
536,458
     $
736,054
  
New performance obligations
    
137,431
      
159,907
      
297,338
  
Recognition of revenue as a result of satisfying performance obligations
    
(153,693
 )    
(270,461
 )    
(424,154
 )
Balance at December 31, 2018
   $
183,334
     $
425,904
     $
609,238
  
Less: non-current portion
    
-
      
(83,255
 )    
(83,255
 )
Current portion at December 31, 2018
   $
183,334
     $
342,649
     $
525,983