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Note 8 - Property and Equipment, Net (Tables)
3 Months Ended
Dec. 31, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31,
   
September 30,
 
   
2020
   
2020
 
Office furniture and equipment
  $
1,244
    $
1,181
 
Machinery and equipment
   
1,193
     
1,184
 
Leasehold improvements
   
2,056
     
2,056
 
Construction in progress
   
28
     
8
 
Property and equipment, gross
   
4,521
     
4,429
 
Accumulated depreciation
   
(2,636
)    
(2,499
)
Property and equipment, net
  $
1,885
    $
1,930
 
Depreciation Expense [Member]  
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
Three months ended December 31,
 
   
2020
   
2019
 
Depreciation expense
  $
99
    $
134