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Note 10 - Segment Information - Information Related to the Operations of the Company's Operating Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Net sales $ 116,115 $ 113,215
Cost of sales 96,750 93,081
Gross profit 19,365 20,134
Operating Segments [Member] | Engineered Steel Pressure Pipe [Member]    
Net sales 78,446 80,007
Cost of sales [1] 66,272 65,765
Gross profit 12,174 14,242
Operating Segments [Member] | Precast Infrastructure and Engineered Systems [Member]    
Net sales 37,669 33,208
Cost of sales [2] 30,478 27,316
Gross profit $ 7,191 $ 5,892
[1] Depreciation and amortization included in Cost of sales for the SPP segment was $2.5 million and $2.7 million for the three months ended March 31, 2025 and 2024, respectively.
[2] Depreciation and amortization included in Cost of sales for the Precast segment was $0.8 million and $0.5 million for the three months ended March 31, 2025 and 2024, respectively.