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Note 4 - Revenue Recognition (Tables) | 3 Months Ended
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Apr. 30, 2023
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended April 30, |
|  | 2023 |  |  | 2022 |
|  | Sales |  |  | % of Total |  |  | Sales |  |  | % of Total |
Products |  | $ | 2,842 |  |  |  | 9 | % |  | $ | 2,912 |  |  |  | 9 | %
Specialty Piping Systems and Coating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized under input method |  |  | 10,338 |  |  |  | 35 | % |  |  | 10,617 |  |  |  | 34 | %
Revenue recognized under output method |  |  | 16,477 |  |  |  | 56 | % |  |  | 17,693 |  |  |  | 57 | %
Total |  | $ | 29,657 |  |  |  | 100 | % |  | $ | 31,222 |  |  |  | 100 | %
Schedule of Assumptions for Long-Duration Contracts by Product and Guarantee [Table Text Block] |
(In thousands) |  | April 30, 2023 |  |  | January 31, 2023 |
Costs incurred on uncompleted contracts |  | $ | 17,909 |  |  | $ | 18,342 |
Estimated earnings |  |  | 9,657 |  |  |  | 9,370 |
Earned revenue |  |  | 27,566 |  |  |  | 27,712 |
Less billings to date |  |  | 28,041 |  |  |  | 26,329 |
(Billings in excess of cost)/costs in excess of billings, net |  | $ | (475 | ) |  | $ | 1,383 |
Balance sheet classification |  |  |  |  |  |  |  |
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 2,974 |  |  | $ | 3,126 |
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (3,449 | ) |  |  | (1,743 | )
(Billings in excess of cost)/costs in excess of billings, net |  | $ | (475 | ) |  | $ | 1,383 |

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