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Note 8 - Goodwill and Intangible Assets (Tables)
6 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
March 31,
   
September 30,
 
   
2019
   
2018
 
Technology
  $
626,648
    $
648,208
 
Customer relationships
   
599,403
     
620,026
 
Trade name portfolio
   
217,965
     
225,464
 
Non-compete agreements
   
236,128
     
244,252
 
Patents
   
72,126
     
72,126
 
     
1,752,270
     
1,810,076
 
Accumulated amortization
   
(396,561
)    
(252,730
)
    $
1,355,709
    $
1,557,346
 
   
Three months ended
   
Six months ended
 
   
March 31,
   
March 31,
 
   
2019
   
2018
   
2019
   
2018
 
Amortization expense
  $
76,633
    $
70,038
    $
153,440
    $
71,842
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Estimated Amortization Expense for the twelve months ended March 31,
       
2020
  $
301,741
 
2021
   
285,128
 
2022
   
222,575
 
2023
   
213,376
 
2024
   
178,288
 
Thereafter
   
154,601
 
Total estimated amortization expense
  $
1,355,709