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Note 2 - Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2024 | Jan. 31, 2023
Realized Gain (Loss), Foreign Currency Transaction, before Tax | $ (100) | $ (300)
Cash and Cash Equivalents, at Carrying Value | 5,845 | 5,773
Restricted Cash and Cash Equivalents | 1,395 | 1,020
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 0 |
Depreciation | 3,800 | 3,700
Finite-Lived Patents, Gross | 2,700 | 2,700
Finite-Lived Intangible Assets, Accumulated Amortization | 2,600 | $ 2,600
Finite-Lived Intangible Asset, Expected Amortization, Year One | 100 |
Finite-Lived Intangible Asset, Expected Amortization, Year Two | 100 |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 8 years
Research and Development Expense | 500 | $ 600
Finite-Lived Intangible Asset, Expected Amortization, Year Three | 100 |
Finite-Lived Intangible Asset, Expected Amortization, Year Four | 100 |
Finite-Lived Intangible Asset, Expected Amortization, Year Five | $ 100 |
Minimum [Member] | Restricted Stock [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 1 year |
Maximum [Member] | Restricted Stock [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 4 years |
Geographic Distribution, Domestic [Member] |  |
Cash and Cash Equivalents, at Carrying Value | $ 100 | 100
Restricted Cash and Cash Equivalents | 0 | 0
Geographic Distribution, Foreign [Member] |  |
Cash and Cash Equivalents, at Carrying Value | 5,700 | 5,700
Restricted Cash and Cash Equivalents | $ 1,400 | $ 1,000

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