Note 9 - Receivables, Net (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

(in thousands)	March 31, 2022		December 31, 2021		March 31, 2021
Contracts completed and in progress:
Billed	$	158,762	$	236,053	$	137,174
Unbilled		111,058		126,371		111,654
Total contracts completed and in progress		269,820		362,424		248,828
Materials sales		45,967		43,746		35,252
Other		65,520		59,496		110,487
Total gross receivables		381,307		465,666		394,567
Less: allowance for credit losses		805		1,078		1,284
Total net receivables	$	380,502	$	464,588	$	393,283