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Note 7 - Intangible Assets (Tables)
12 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
September 30,
 
   
2017
   
2016
 
Cost
  $
108,247
    $
108,247
 
Accumulated amortization
   
(52,558
)    
(45,342
)
Intangible assets, net
  $
55,689
    $
62,905
 
   
Year ended September 30,
 
   
2017
   
2016
 
Amortization expense
  $
7,216
    $
6,752
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Estimated Amortization Expense Years Ended September 30,
 
 
 
 
2018
  $
6,535
 
2019
   
6,247
 
2020
   
5,924
 
2021
   
5,636
 
2022
   
5,506
 
Thereafter
   
25,841
 
Total estimated amortization expense
  $
55,689