Note 9 - Receivables, Net (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

					As Restated
	March 31, 2020		December 31, 2019		March 31, 2019
Contracts completed and in progress:
Billed	$	250,683	$	299,633	$	200,092
Unbilled		141,514		149,696		112,892
Total contracts completed and in progress		392,197		449,329		312,984
Material sales		34,268		42,936		29,948
Other		52,645		55,526		38,380
Total gross receivables		479,110		547,791		381,312
Less: allowance for credit losses		1,392		374		327
Total net receivables	$	477,718	$	547,417	$	380,985