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Note 4 - Revenue Recognition (Tables) | 6 Months Ended
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Jul. 31, 2022
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended July 31, |  |  | Six Months Ended July 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
|  | Sales |  |  | % to Total |  |  | Sales |  |  | % to Total |  |  | Sales |  |  | % to Total |  |  | Sales |  |  | % to Total |
Products |  |  | 3,868 |  |  |  | 11 | % |  | $ | 4,548 |  |  |  | 11 | % |  |  | 6,780 |  |  |  | 10 | % |  | $ | 7,135 |  |  |  | 11 | %
Specialty Piping Systems and Coating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized under input method |  |  | 12,707 |  |  |  | 34 | % |  |  | 13,999 |  |  |  | 35 | % |  |  | 23,325 |  |  |  | 34 | % |  |  | 23,952 |  |  |  | 37 | %
Revenue recognized under output method |  |  | 20,428 |  |  |  | 55 | % |  |  | 21,257 |  |  |  | 54 | % |  |  | 38,120 |  |  |  | 56 | % |  |  | 33,140 |  |  |  | 52 | %
Total |  | $ | 37,003 |  |  |  | 100 | % |  | $ | 39,804 |  |  |  | 100 | % |  | $ | 68,225 |  |  |  | 100 | % |  | $ | 64,227 |  |  |  | 100 | %
Schedule of Assumptions for Long-Duration Contracts by Product and Guarantee [Table Text Block] |
(In thousands) |  | July 31, 2022 |  |  | January 31, 2022 |
Costs incurred on uncompleted contracts |  | $ | 21,054 |  |  | $ | 20,021 |
Estimated earnings |  |  | 11,422 |  |  |  | 12,030 |
Earned revenue |  |  | 32,476 |  |  |  | 32,051 |
Less billings to date |  |  | 27,997 |  |  |  | 31,019 |
Costs in excess of billings, net |  | $ | 4,479 |  |  | $ | 1,032 |
Balance sheet classification |  |  |  |  |  |  |  |
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 5,946 |  |  | $ | 2,309 |
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (1,467 | ) |  |  | (1,277 | )
Costs in excess of billings, net |  | $ | 4,479 |  |  | $ | 1,032 |

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