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Note 4 - Revenue Recognition (Tables) | 3 Months Ended
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Apr. 30, 2022
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended April 30, |
|  | 2022 |  |  | 2021 |
|  | Sales |  |  | % to Total |  |  | Sales |  |  | % to Total |
Products |  |  | 2,912 |  |  |  | 9 | % |  | $ | 2,587 |  |  |  | 10 | %
Specialty Piping Systems and Coating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized under input method |  |  | 10,617 |  |  |  | 34 | % |  |  | 9,952 |  |  |  | 41 | %
Revenue recognized under output method |  |  | 17,693 |  |  |  | 57 | % |  |  | 11,884 |  |  |  | 49 | %
Total |  | $ | 31,222 |  |  |  | 100 | % |  | $ | 24,423 |  |  |  | 100 | %
Schedule of Assumptions for Long-Duration Contracts by Product and Guarantee [Table Text Block] |
(In thousands) |  | April 30, 2022 |  |  | January 31, 2022 |
Costs incurred on uncompleted contracts |  | $ | 23,326 |  |  | $ | 20,021 |
Estimated earnings |  |  | 13,531 |  |  |  | 12,030 |
Earned revenue |  |  | 36,857 |  |  |  | 32,051 |
Less billings to date |  |  | 32,026 |  |  |  | 31,019 |
Costs in excess of billings, net |  | $ | 4,831 |  |  | $ | 1,032 |
Balance sheet classification |  |  |  |  |  |  |  |
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 6,004 |  |  | $ | 2,309 |
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (1,173 | ) |  |  | (1,277 | )
Costs in excess of billings, net |  | $ | 4,831 |  |  | $ | 1,032 |

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