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Note 4 - Revenue Recognition (Tables) | 12 Months Ended
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Jan. 31, 2024
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | 2023 |  |  | 2022 |
|  | Sales |  |  | % to Total |  |  | Sales |  |  | % to Total |
Products |  | $ | 10,368 |  |  |  | 7 | % |  | $ | 14,626 |  |  |  | 10 | %
Specialty Piping Systems and Coating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized under input method |  |  | 51,977 |  |  |  | 34 | % |  |  | 44,648 |  |  |  | 31 | %
Revenue recognized under output method |  |  | 88,323 |  |  |  | 59 | % |  |  | 83,295 |  |  |  | 59 | %
Total |  | $ | 150,668 |  |  |  | 100 | % |  | $ | 142,569 |  |  |  | 100 | %
Schedule of Assumptions for Long-Duration Contracts by Product and Guarantee [Table Text Block] |
|  | 2023 |  |  | 2022 |
Costs incurred on uncompleted contracts |  | $ | 21,912 |  |  | $ | 18,342 |
Estimated earnings |  |  | 11,270 |  |  |  | 9,370 |
Earned revenue |  |  | 33,182 |  |  |  | 27,712 |
Less billings to date |  |  | 30,580 |  |  |  | 26,329 |
Costs in excess of billings, net |  | $ | 2,602 |  |  | $ | 1,383 |
Balance sheet classification |  |  |  |  |  |  |  |
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 3,097 |  |  | $ | 3,126 |
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (495 | ) |  |  | (1,743 | )
Costs in excess of billings, net |  | $ | 2,602 |  |  | $ | 1,383 |

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