Concentration of Risk and Enterprise-Wide Disclosures (Tables)

3 Months Ended

Mar. 31, 2022

Trade and contract retainage receivables

Concentration Risk [Line Items]

Schedules of concentration of risk, by risk factor

	March 31, 2022				December 31, 2021
Federal Government	$	8,380	6	%	$	6,563	5	%
State Governments		571	-	%		61	-	%
Local Governments		19,929	14	%		11,923	9	%
Private Companies		114,690	80	%		111,328	86	%
Gross receivables		143,570	100	%		129,875	100	%
Allowance for credit losses		(323)				(323)
Net receivables	$	143,247			$	129,552

Contract revenues

Concentration Risk [Line Items]

Schedules of concentration of risk, by risk factor

	Three months ended March 31,
	2022		%		2021		%
Federal Government	$	22,695	13	%	$	12,764	8	%
State Governments		7,704	4	%		168	-	%
Local Governments		32,402	19	%		33,516	22	%
Private Companies		112,130	64	%		106,861	70	%
Total contract revenues	$	174,931	100	%	$	153,309	100	%