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Inventories (Tables)
 12 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Net Inventories
Net inventories consist of the following:
 
     September 30,  
     2020      2019  
Raw materials
    $ 14,607,000      $ 14,158,000  
Work in process
      3,633,000        1,397,000  
Finished goods
      8,810,000        9,811,000  
Used equipment
      40,000       
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Inventories, net
    $ 27,090,000      $ 25,366,000