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Note 4 - Revenue Recognition (Tables) | 9 Months Ended
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Oct. 31, 2021
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended October 31, |  |  | Nine Months Ended October 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
|  | Sales |  |  | % to Total |  |  | Sales |  |  | % to Total |  |  | Sales |  |  | % to Total |  |  | Sales |  |  | % to Total |
Products |  |  | 3,340 |  |  |  | 10 | % |  | $ | 2,435 |  |  |  | 12 | % |  |  | 10,475 |  |  |  | 11 | % |  | $ | 8,603 |  |  |  | 14 | %
Specialty Piping Systems and Coating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized under input method |  |  | 9,166 |  |  |  | 26 | % |  |  | 8,252 |  |  |  | 41 | % |  |  | 33,118 |  |  |  | 33 | % |  |  | 26,597 |  |  |  | 42 | %
Revenue recognized under output method |  |  | 22,693 |  |  |  | 64 | % |  |  | 9,607 |  |  |  | 47 | % |  |  | 55,833 |  |  |  | 56 | % |  |  | 28,199 |  |  |  | 44 | %
Total |  | $ | 35,199 |  |  |  | 100 | % |  | $ | 20,294 |  |  |  | 100 | % |  | $ | 99,426 |  |  |  | 100 | % |  | $ | 63,399 |  |  |  | 100 | %
Schedule of Assumptions for Long-Duration Contracts by Product and Guarantee [Table Text Block] |
(In thousands) |  | October 31, 2021 |  |  | January 31, 2021 |
Costs incurred on uncompleted contracts |  | $ | 19,077 |  |  | $ | 17,543 |
Estimated earnings |  |  | 11,359 |  |  |  | 9,651 |
Earned revenue |  |  | 30,436 |  |  |  | 27,194 |
Less billings to date |  |  | 28,985 |  |  |  | 23,949 |
Costs in excess of billings, net |  | $ | 1,451 |  |  | $ | 3,245 |
Balance sheet classification |  |  |  |  |  |  |  |
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 2,322 |  |  | $ | 4,007 |
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (871 | ) |  |  | (762 | )
Costs in excess of billings, net |  | $ | 1,451 |  |  | $ | 3,245 |

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