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Note 8 - Property and Equipment, Net (Tables)
6 Months Ended
Mar. 31, 2021
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31,
   
September 30,
 
   
2021
   
2020
 
Office furniture and equipment
  $
1,233
    $
1,181
 
Machinery and equipment
   
1,230
     
1,184
 
Leasehold improvements
   
2,150
     
2,056
 
Construction in progress
   
16
     
8
 
Property and equipment, gross
   
4,629
     
4,429
 
Accumulated depreciation
   
(2,728
)    
(2,499
)
Property and equipment, net
  $
1,901
    $
1,930