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Note 8 - Goodwill and Intangible Assets (Tables)
6 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
March 31,
   
September 30,
 
   
2020
   
2019
 
Technology
  $
614,519
    $
611,043
 
Customer relationships
   
587,801
     
584,477
 
Trade name portfolio
   
213,746
     
212,537
 
Non-compete agreements
   
231,558
     
230,248
 
Patents
   
72,126
     
72,126
 
     
1,719,750
     
1,710,431
 
Accumulated amortization
   
(685,589
)    
(534,797
)
    $
1,034,161
    $
1,175,634
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Fiscal year ending September 30,
 
 
 
 
2020 (remaining six months)
  $
148,666
 
2021
   
240,926
 
2022
   
218,285
 
2023
   
187,542
 
2024
   
174,661
 
Thereafter
   
64,081
 
Total estimated amortization expense
  $
1,034,161