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Note 3 - Accounts Receivable (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended | 103 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2024 USD ($) | Jul. 31, 2023 | Jul. 31, 2024 USD ($) | Jul. 31, 2023 USD ($) | Jan. 31, 2024 | Jul. 31, 2024 USD ($) | Dec. 31, 2015 USD ($)
Increase (Decrease) in Accounts Receivable |  |  | $ (6,454) | $ 9,865 |  |  |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |
Number of Major Customers | 0 | 1 | 0 | 0 |  |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |
Number of Major Customers |  |  | 0 |  | 1 |  |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |  |
Accounts Receivable, after Allowance for Credit Loss | $ 1,800 |  | $ 1,800 |  |  | $ 1,800 | $ 41,900
Increase (Decrease) in Accounts Receivable |  |  | (300) | $ (600) |  | (40,100) |
Accounts Receivable, Allowance for Credit Loss | 0 |  | 0 |  |  | 0 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other Noncurrent Assets [Member] |  |  |  |  |  |  |
Accounts Receivable, after Allowance for Credit Loss | $ 1,300 |  | $ 1,300 |  |  | $ 1,300 |

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