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Note 8 - Goodwill and Intangible Assets (Tables)
9 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
June 30,
   
September 30,
 
   
2020
   
2019
 
Technology
  $
628,386
    $
611,043
 
Customer relationships
   
601,065
     
584,477
 
Trade name portfolio
   
218,569
     
212,537
 
Non-compete agreements
   
236,782
     
230,248
 
Patents
   
72,126
     
72,126
 
     
1,756,928
     
1,710,431
 
Accumulated amortization
   
(775,742
)    
(534,797
)
    $
981,186
    $
1,175,634
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Fiscal year ending September 30,
       
2020 (remaining three months)
  $
75,592
 
2021
   
246,275
 
2022
   
223,126
 
2023
   
191,882
 
2024
   
178,581
 
Thereafter
   
65,730
 
Total estimated amortization expense
  $
981,186