| Segment Reporting [Table Text Block] |
| | | Three Months Ended July 31, | |
| | | 2026 | | | 2025 | |
| | | Seamap | | | Corporate Expenses | | | Consolidated | | | Seamap | | | Corporate Expenses | | | Consolidated | |
| Revenues | | $ | 5,622 | | | $ | — | | | $ | 5,622 | | | $ | 13,561 | | | $ | — | | | $ | 13,561 | |
| Cost of sales | | | 3,532 | | | | — | | | | 3,532 | | | | 6,732 | | | | — | | | | 6,732 | |
| Selling, general and administrative | | | 1,689 | | | | 1,566 | | | | 3,255 | | | | 1,629 | | | | 2,008 | | | | 3,637 | |
| Research and development | | | 296 | | | | 111 | | | | 407 | | | | 206 | | | | 105 | | | | 311 | |
| Depreciation and amortization expense | | | 224 | | | | — | | | | 224 | | | | 213 | | | | 4 | | | | 217 | |
| Operating (loss) income | | | (119 | ) | | | (1,677 | ) | | | (1,796 | ) | | | 4,781 | | | | (2,117 | ) | | | 2,664 | |
| Capital expenditures | | | 88 | | | | 20 | | | | 108 | | | | 181 | | | | 1 | | | | 182 | |
| | | Six Months Ended July 31, | |
| | | 2026 | | | 2025 | |
| | | Seamap | | | Corporate Expenses | | | Consolidated | | | Seamap | | | Corporate Expenses | | | Consolidated | |
| Revenues | | $ | 15,294 | | | $ | — | | | $ | 15,294 | | | $ | 21,463 | | | $ | — | | | $ | 21,463 | |
| Cost of sales | | | 9,107 | | | | — | | | | 9,107 | | | | 11,303 | | | | — | | | | 11,303 | |
| Selling, general and administrative | | | 3,115 | | | | 3,685 | | | | 6,800 | | | | 3,306 | | | | 3,715 | | | | 7,021 | |
| Research and development | | | 518 | | | | 199 | | | | 717 | | | | 508 | | | | 183 | | | | 691 | |
| Depreciation and amortization expense | | | 452 | | | | — | | | | 452 | | | | 433 | | | | 9 | | | | 442 | |
| Operating income (loss) | | | 2,102 | | | | (3,884 | ) | | | (1,782 | ) | | | 5,913 | | | | (3,907 | ) | | | 2,006 | |
| Capital expenditures | | | 136 | | | | 20 | | | | 156 | | | | 392 | | | | 27 | | | | 419 | |
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| Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] |
| | | Three Months Ended July 31, | | | Six Months Ended July 31, | |
| | | 2026 | | | 2025 | | | 2026 | | | 2025 | |
| Seamap | | | (119 | ) | | | 4,781 | | | | 2,102 | | | | 5,913 | |
| Corporate Expenses | | | (1,677 | ) | | | (2,117 | ) | | | (3,884 | ) | | | (3,907 | ) |
| Operating (loss) income | | | (1,796 | ) | | | 2,664 | | | | (1,782 | ) | | | 2,006 | |
| | | | | | | | | | | | | | | | | |
| Other income (expense) | | | 80 | | | | (65 | ) | | | 131 | | | | (83 | ) |
| Income (loss) before income taxes | | | (1,716 | ) | | | 2,599 | | | | (1,651 | ) | | | 1,923 | |
|