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Note 4 - Debts and Commitments (Tables)
 12 Months Ended
Sep. 30, 2019
Notes Tables  
Contractual Obligation, Fiscal Year Maturity [Table Text Block]
   
Payments due by Fiscal Year
  
   
 
2020
    
 
2021
    
 
2022
    
 
2023
    
 
2024
    
2025
and after
    
 
Total
  
Real estate loan
   $
126,000
     $
133,000
     $
139,000
     $
146,000
     $
153,000
     $
1,138,000
     $
1,835,000
  
Obligations under operating leases
    
474,000
      
40,000
      
---
      
---
      
---
      
---
      
514,000
  
Long-term accrued liabilities*
  
 
---
      
23,000
      
8,000
      
13,000
      
51,000
      
135,000
      
230,000
  
    $
600,000
     $
196,000
     $
147,000
     $
159,000
     $
204,000
     $
1,273,000
     $
2,579,000