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Costs and Estimated Earnings in Excess of Billings (Tables)
 12 Months Ended
Sep. 30, 2021
Text Block [Abstract]  
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts
Costs and estimated earnings in excess of billings on uncompleted contracts as of September 30, 2021 and 2020 consisted of the following:
 
 
  
September 30,
 
 
  
2021
 
  
2020
 
Costs incurred on uncompleted contracts
   
$
11,483,000
 
   
$
10,390,000
 
Estimated earnings
   
 
4,395,000
 
   
 
4,680,000
 
    
 
 
     
 
 
  
    
 
15,878,000
 
   
 
15,070,000
 
Billings to date
   
 
13,975,000
 
   
 
8,665,000
 
    
 
 
     
 
 
  
Costs and estimated earnings in excess of billings
   
$
1,903,000
 
   
$
6,405,000