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Note 8 - Property and Equipment, Net
 6 Months Ended
Mar. 31, 2021
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]
8.
PROPERTY AND EQUIPMENT, NET
 
Property and equipment, net consisted of the following:
 
   
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
  
 
Depreciation expense was
$101
and
$132
for the
three
months ended
March 31, 2021
and
2020,
respectively. Depreciation expense was
$200
and
$266
for the
six
months ended
March 31, 2021
and
2020,
respectively.