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Note 10 - Prepaid Expenses and Other (Tables)
6 Months Ended
Mar. 31, 2021
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
   
March 31,
   
September 30,
 
   
2021
   
2020
 
Deposits for inventory
  $
52
    $
54
 
Prepaid insurance
   
531
     
264
 
Dues and subscriptions
   
146
     
151
 
Trade shows and travel
   
92
     
103
 
Other
   
261
     
288
 
    $
1,082
    $
860