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Note 4 - Revenue Recognition (Tables) | 12 Months Ended
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Jan. 31, 2021
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | 2020 |  |  | 2019 |
|  | Sales |  |  | % to Total |  |  | Sales |  |  | % to Total |
Products |  | $ | 11,496 |  |  |  | 14 | % |  | $ | 15,991 |  |  |  | 12 | %
Specialty Piping Systems and Coating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized under input method |  |  | 35,041 |  |  |  | 41 | % |  |  | 48,415 |  |  |  | 38 | %
Revenue recognized under output method |  |  | 38,157 |  |  |  | 45 | % |  |  | 63,257 |  |  |  | 50 | %
Total |  | $ | 84,694 |  |  |  | 100 | % |  | $ | 127,663 |  |  |  | 100 | %
Schedule of Assumptions for Long-Duration Contracts by Product and Guarantee [Table Text Block] |
(In thousands) |  | 2020 |  |  | 2019 |
Costs incurred on uncompleted contracts |  | $ | 17,543 |  |  | $ | 15,553 |
Estimated earnings |  |  | 9,651 |  |  |  | 8,641 |
Earned revenue |  |  | 27,194 |  |  |  | 24,194 |
Less billings to date |  |  | 23,949 |  |  |  | 23,201 |
Costs in excess of billings, net |  | $ | 3,245 |  |  | $ | 993 |
Balance sheet classification |  |  |  |  |  |  |  |
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 4,007 |  |  | $ | 2,166 |
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (762 | ) |  |  | (1,173 | )
Costs in excess of billings, net |  | $ | 3,245 |  |  | $ | 993 |

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