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Note 4 - Revenue Recognition (Tables) | 6 Months Ended
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Jul. 31, 2023
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended July 31, |  |  | Six Months Ended July 31, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
|  | Sales |  |  | % of Total |  |  | Sales |  |  | % of Total |  |  | Sales |  |  | % of Total |  |  | Sales |  |  | % of Total |
Products |  | $ | 2,146 |  |  |  | 7 | % |  | $ | 3,869 |  |  |  | 11 | % |  | $ | 4,988 |  |  |  | 7 | % |  | $ | 6,780 |  |  |  | 10 | %
Specialty Piping Systems and Coating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized under input method |  |  | 12,801 |  |  |  | 36 | % |  |  | 12,707 |  |  |  | 34 | % |  |  | 23,139 |  |  |  | 36 | % |  |  | 23,325 |  |  |  | 34 | %
Revenue recognized under output method |  |  | 20,194 |  |  |  | 57 | % |  |  | 20,427 |  |  |  | 55 | % |  |  | 36,671 |  |  |  | 57 | % |  |  | 38,120 |  |  |  | 56 | %
Total |  | $ | 35,141 |  |  |  | 100 | % |  | $ | 37,003 |  |  |  | 100 | % |  | $ | 64,798 |  |  |  | 100 | % |  | $ | 68,225 |  |  |  | 100 | %
Schedule of Assumptions for Long-Duration Contracts by Product and Guarantee [Table Text Block] |
(In thousands) |  | July 31, 2023 |  |  | January 31, 2023 |
Costs incurred on uncompleted contracts |  | $ | 21,871 |  |  | $ | 18,342 |
Estimated earnings |  |  | 12,366 |  |  |  | 9,370 |
Earned revenue |  |  | 34,237 |  |  |  | 27,712 |
Less billings to date |  |  | 35,349 |  |  |  | 26,329 |
(Billings in excess of costs) costs in excess of billings, net |  | $ | (1,112 | ) |  | $ | 1,383 |
Balance sheet classification |  |  |  |  |  |  |  |
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 1,856 |  |  | $ | 3,126 |
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (2,968 | ) |  |  | (1,743 | )
(Billings in excess of costs) costs in excess of billings, net |  | $ | (1,112 | ) |  | $ | 1,383 |

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