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Note 11 - Segment Information - Information Related to the Operations of the Company's Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Net sales $ 133,182 $ 129,505 $ 249,297 $ 242,720
Cost of sales 107,817 103,691 204,567 196,772
Gross profit 25,365 25,814 44,730 45,948
Operating Segments [Member] | Water Transmission Systems [Member[]        
Net sales 84,588 89,523 163,034 169,530
Cost of sales [1] 69,533 72,542 135,805 138,307
Gross profit 15,055 16,981 27,229 31,223
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member]        
Net sales 48,594 39,982 86,263 73,190
Cost of sales [2] 38,284 31,149 68,762 58,465
Gross profit $ 10,310 $ 8,833 $ 17,501 $ 14,725
[1] Depreciation and amortization included in Cost of sales for the WTS segment was $2.9 million and $5.4 million for the three and six months ended June 30, 2025, respectively and $2.9 million and $5.6 million for the three and six months ended June 30, 2024, respectively.
[2] Depreciation and amortization included in Cost of sales for the Precast segment was $0.8 million and $1.6 million for the three and six months ended June 30, 2025, respectively and $0.7 million and $1.2 million for the three and six months ended June 30, 2024, respectively.