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Costs and Estimated Earnings in Excess of Billings and Billings in Excess of Costs and Estimated Earnings (Tables)
 9 Months Ended
Jun. 30, 2021
Text Block [Abstract]  
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts
 
     June 30,
 
2021		      September 30, 2020  
Costs incurred on uncompleted contracts
    $ 7,975,000      $  10,390,000  
Estimated earnings
      3,368,000        4,680,000  
    
 
 
     
 
 
  
       11,343,000        15,070,000  
Billings to date
      12,028,000        8,665,000  
    
 
 
     
 
 
  
Costs and estimated earnings in excess of billings
    $ —      $ 6,405,000  
Bill
ings in excess 
of costs and estimated
 earnings
 
$
685,000
 
 
 
$
—