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Note 12 - Segment Information - Information Related to the Operations of the Company's Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net sales $ 151,067 $ 130,201 $ 400,364 $ 372,921
Cost of sales 118,917 103,182 323,484 299,954
Gross profit 32,150 27,019 76,880 72,967
Operating Segments [Member] | Water Transmission Systems [Member]        
Net sales 103,866 85,924 266,900 255,454
Cost of sales [1] 81,750 69,296 217,555 207,603
Gross profit 22,116 16,628 49,345 47,851
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member]        
Net sales 47,201 44,277 133,464 117,467
Cost of sales [2],[3] 37,167 33,886 105,929 92,351
Gross profit $ 10,034 $ 10,391 $ 27,535 $ 25,116
[1] Depreciation and amortization included in Cost of sales for the WTS segment was $3.0 million and $8.4 million for the three and nine months ended September 30, 2025, respectively and $3.1 million and $8.8 million for the three and nine months ended September 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.
[3] Depreciation and amortization included in Cost of sales for the Precast segment was $1.1 million and $2.7 million for the three and nine months ended September 30, 2025, respectively and $0.9 million and $2.1 million for the three and nine months ended September 30, 2024, respectively.