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Note 4 - Revenue Recognition (Tables) | 6 Months Ended
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Jul. 31, 2025
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended July 31, |  |  | Six Months Ended July 31, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | Sales |  |  | % of Total |  |  | Sales |  |  | % of Total |  |  | Sales |  |  | % of Total |  |  | Sales |  |  | % of Total |
Products |  | $ | 3,451 |  |  |  | 7 | % |  | $ | 2,795 |  |  |  | 7 | % |  | $ | 7,091 |  |  |  | 8 | % |  | $ | 6,048 |  |  |  | 8 | %
Specialty Piping Systems and Coating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized under input method |  |  | 12,965 |  |  |  | 27 | % |  |  | 12,613 |  |  |  | 34 | % |  |  | 25,025 |  |  |  | 26 | % |  |  | 22,752 |  |  |  | 32 | %
Revenue recognized under output method |  |  | 31,486 |  |  |  | 66 | % |  |  | 22,105 |  |  |  | 59 | % |  |  | 62,532 |  |  |  | 66 | % |  |  | 43,034 |  |  |  | 60 | %
Total |  | $ | 47,902 |  |  |  | 100 | % |  | $ | 37,513 |  |  |  | 100 | % |  | $ | 94,648 |  |  |  | 100 | % |  | $ | 71,834 |  |  |  | 100 | %
Schedule of Assumptions for Long-Duration Contracts by Product and Guarantee [Table Text Block] |
|  | July 31, 2025 |  |  | January 31, 2025 |
Costs incurred on uncompleted contracts |  | $ | 16,079 |  |  | $ | 11,621 |
Estimated earnings |  |  | 10,842 |  |  |  | 9,366 |
Earned revenue |  |  | 26,921 |  |  |  | 20,987 |
Less billings to date |  |  | 24,993 |  |  |  | 19,302 |
Costs in excess of billings, net |  | $ | 1,928 |  |  | $ | 1,685 |
Balance sheet classification |  |  |  |  |  |  |  |
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 3,569 |  |  | $ | 2,934 |
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (1,641 | ) |  |  | (1,249 | )
Costs in excess of billings, net |  | $ | 1,928 |  |  | $ | 1,685 |

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