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Note 7 - Property and Equipment
 12 Months Ended
Sep. 30, 2020
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]
7
. PROPERTY AND EQUIPMENT
 
Property and equipment consisted of the following: 
 
   
September 30,
  
   
2020
    
2019
  
Office furniture and equipment
   $
1,181
     $
1,498
  
Machinery and equipment
    
1,184
      
1,224
  
Leasehold improvements
    
2,056
      
2,019
  
Construction in progress
    
8
      
8
  
Property and equipment, gross
    
4,429
      
4,749
  
Accumulated depreciation
    
(2,499
 )    
(2,480
 )
Property and equipment, net
   $
1,930
     $
2,269
  
 
   
2020
    
2019
  
Depreciation expense
   $
498
     $
521