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Note 6 - Inventories (Tables)
12 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30,
 
   
2020
   
2019
 
Raw materials
  $
5,220
    $
5,060
 
Finished goods
   
841
     
999
 
Work in process
   
456
     
307
 
Inventories, gross
   
6,517
     
6,366
 
Reserve for obsolescence
   
(568
)    
(531
)
Inventories, net
  $
5,949
    $
5,835