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Note 4 - Revenue Recognition (Tables) | 6 Months Ended
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Jul. 31, 2021
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended July 31, |  |  | Six Months Ended July 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
|  | Sales |  |  | % to Total |  |  | Sales |  |  | % to Total |  |  | Sales |  |  | % to Total |  |  | Sales |  |  | % to Total |
Products |  | $ | 4,548 |  |  |  | 11 | % |  | $ | 1,703 |  |  |  | 8 | % |  | $ | 7,135 |  |  |  | 11 | % |  | $ | 6,168 |  |  |  | 14 | %
Specialty Piping Systems and Coating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized under input method |  |  | 13,999 |  |  |  | 35 | % |  |  | 9,784 |  |  |  | 48 | % |  |  | 23,952 |  |  |  | 37 | % |  |  | 18,346 |  |  |  | 43 | %
Revenue recognized under output method |  |  | 21,257 |  |  |  | 54 | % |  |  | 8,877 |  |  |  | 44 | % |  |  | 33,140 |  |  |  | 52 | % |  |  | 18,592 |  |  |  | 43 | %
Total |  | $ | 39,804 |  |  |  | 100 | % |  | $ | 20,364 |  |  |  | 100 | % |  | $ | 64,227 |  |  |  | 100 | % |  | $ | 43,106 |  |  |  | 100 | %
Schedule of Assumptions for Long-Duration Contracts by Product and Guarantee [Table Text Block] |
(In thousands) |  | July 31, 2021 |  | January 31, 2021
Costs incurred on uncompleted contracts |  | $ 20,705 |  | $ 17,543
Estimated earnings |  | 10,986 |  | 9,651
Earned revenue |  | 31,691 |  | 27,194
Less billings to date |  | 31,759 |  | 23,949
Costs in excess of billings, net |  | $ (68) |  | $ 3,245
Balance sheet classification |  |  |  |
Contract assets: Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ 1,713 |  | $ 4,007
Contract liabilities: Billings in excess of costs and estimated earnings on uncompleted contracts |  | (1,781) |  | (762)
Costs in excess of billings, net |  | $ (68) |  | $ 3,245

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