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Note 8 - Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Balance as of September 30, 2021 $ 10,118  
Balance as of September 30, 2021 10,505  
Currency translation, goodwill 164  
Amortization (2,108) $ (2,154)
Balance as of September 30, 2022 10,282 10,118
Currency translation 30  
Balance as of September 30, 2022 8,427 10,505
Hardware [Member]    
Balance as of September 30, 2021 0  
Balance as of September 30, 2021 21  
Currency translation, goodwill 0  
Amortization (4)  
Balance as of September 30, 2022 0 0
Currency translation 0  
Balance as of September 30, 2022 17 21
Software [Member]    
Balance as of September 30, 2021 10,118  
Balance as of September 30, 2021 10,484  
Currency translation, goodwill 164  
Amortization (2,104)  
Balance as of September 30, 2022 10,282 10,118
Currency translation 30  
Balance as of September 30, 2022 $ 8,410 $ 10,484