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Note 10 - Prepaid Expenses and Other (Tables)
3 Months Ended
Dec. 31, 2020
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
   
December 31,
   
September 30,
 
   
2020
   
2020
 
Deposits for inventory
  $
90
    $
54
 
Prepaid insurance
   
185
     
264
 
Dues and subscriptions
   
106
     
151
 
Trade shows and travel
   
104
     
103
 
Other
   
228
     
288
 
    $
713
    $
860