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Note 14 - Revenue (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Net sales by geographic region: |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 313,729 |  |  | $ | 254,956 |  |  | $ | 252,797 |
Canada |  |  | 19,584 |  |  |  | 30,951 |  |  |  | 26,520 |
Total |  | $ | 333,313 |  |  | $ | 285,907 |  |  | $ | 279,317 |
Disaggregation of Revenue [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Over time (Engineered Steel Pressure Pipe) |  | $ | 259,823 |  |  | $ | 241,690 |  |  | $ | 279,317 |
Point in time (Precast Infrastructure and Engineered Systems) |  |  | 73,490 |  |  |  | 44,217 |  |  |  | - |
Net sales |  | $ | 333,313 |  |  | $ | 285,907 |  |  | $ | 279,317 |

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