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ACCOUNTS RECEIVABLE, Accounts Receivable (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Accounts Receivable [Abstract]
Accounts receivable	$ 4,141,589		$ 4,141,589		$ 6,299,957
Allowance for doubtful accounts	(84,000)		(84,000)		(84,000)
Total	4,057,589		4,057,589		6,215,957
Bad debt expense	0	$ 0	0	$ 0
Contracts in Progress [Member]
Accounts Receivable [Abstract]
Accounts receivable	4,042,435		4,042,435		6,206,760
Retainage [Member]
Accounts Receivable [Abstract]
Accounts receivable	$ 99,154		$ 99,154		$ 93,197