Note 9 - Receivables, Net (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

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

(in thousands)	June 30, 2022		December 31, 2021		June 30, 2021
Contracts completed and in progress:
Billed	$	221,084	$	236,053	$	187,188
Unbilled		160,336		126,371		189,332
Total contracts completed and in progress		381,420		362,424		376,520
Materials sales		75,634		43,746		64,017
Other		71,352		59,496		104,756
Total gross receivables		528,406		465,666		545,293
Less: allowance for credit losses		1,129		1,078		1,379
Total net receivables	$	527,277	$	464,588	$	543,914