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UNCOMPLETED CONTRACTS (Tables)
 3 Months Ended
Mar. 31, 2022
Contractors [Abstract]  
Contract with Customer, Contract Asset, Contract Liability, and Receivable
Costs, estimated earnings and billings on uncompleted contracts are summarized as follows at March 31, 2022 and December 31, 2021:

 March 31, 2022 December 31, 2021
Costs incurred on uncompleted contracts$8,556,100 $5,991,300 
Estimated earnings968,500 811,600 
Costs and estimated earnings on uncompleted contracts9,524,600 6,802,900 
Billings to date6,885,500 4,635,700 
Costs and estimated earnings in excess of billings on uncompleted contracts2,639,100 2,167,200 
Billings in excess of costs and estimated earnings on uncompleted contracts
— — 
$2,639,100 $2,167,200