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Note 4 - Revenue Recognition (Tables) | 3 Months Ended
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Apr. 30, 2025
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended April 30, |
|  | 2025 |  |  | 2024 |
|  | Sales |  |  | % of Total |  |  | Sales |  |  | % of Total |
Products |  | $ | 3,640 |  |  |  | 8 | % |  | $ | 3,253 |  |  |  | 9 | %
Specialty Piping Systems and Coating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized under input method |  |  | 12,060 |  |  |  | 26 | % |  |  | 10,140 |  |  |  | 30 | %
Revenue recognized under output method |  |  | 31,047 |  |  |  | 66 | % |  |  | 20,928 |  |  |  | 61 | %
Total |  | $ | 46,747 |  |  |  | 100 | % |  | $ | 34,321 |  |  |  | 100 | %
Schedule of Assumptions for Long-Duration Contracts by Product and Guarantee [Table Text Block] |
|  | April 30, 2025 |  |  | January 31, 2025 |
Costs incurred on uncompleted contracts |  | $ | 13,859 |  |  | $ | 11,621 |
Estimated earnings |  |  | 9,984 |  |  |  | 9,366 |
Earned revenue |  |  | 23,843 |  |  |  | 20,987 |
Less billings to date |  |  | 21,362 |  |  |  | 19,302 |
Costs in excess of billings, net |  | $ | 2,481 |  |  | $ | 1,685 |
Balance sheet classification |  |  |  |  |  |  |  |
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 3,472 |  |  | $ | 2,934 |
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (991 | ) |  |  | (1,249 | )
Costs in excess of billings, net |  | $ | 2,481 |  |  | $ | 1,685 |

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