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Note 8 - Goodwill and Intangible Assets (Tables)
12 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
September 30,
 
   
2020
   
2019
 
Technology
  $
655
    $
611
 
Customer relationships
   
627
     
584
 
Trade name portfolio
   
228
     
213
 
Non-compete agreements
   
247
     
230
 
Patents
   
72
     
72
 
     
1,829
     
1,710
 
Accumulated amortization
   
(886
)    
(534
)
    $
943
    $
1,176
 
   
Year ended
 
   
September 30,
 
   
2020
   
2019
 
Amortization expense
  $
302
    $
304
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
2021
  $
257
 
2022
   
232
 
2023
   
200
 
2024
   
186
 
2025
   
56
 
Thereafter
   
12
 
Total estimated amortization expense
  $
943