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Note 2 - Significant Accounting Policies (Details Textual) $ in Thousands |  | 1 Months Ended | 12 Months Ended | 85 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 26, 2022 shares | Jun. 30, 2022 USD ($) | Jan. 31, 2023 USD ($) | Jan. 31, 2022 USD ($) | Jan. 31, 2023 USD ($) | Dec. 31, 2015 USD ($)
Foreign Currency Transaction Gain (Loss), Realized |  |  | $ 300 | $ 100 |  |
Cash and Cash Equivalents, at Carrying Value, Total |  |  | 5,773 | 8,214 | $ 5,773 |
Broker-Dealer, Draft Payable |  |  | 200 | 200 | 200 |
Restricted Cash and Cash Equivalents, Total |  |  | 1,020 | 1,557 | 1,020 |
Accounts Receivable, Outstanding for Several Years |  |  | 2,700 |  | 2,700 | $ 41,900
Retention Receivable, Settlement Amount |  | $ 900 |  |  | 39,100 |
Retention Receivable |  |  | 2,500 |  | 2,500 |
Depreciation, Total |  |  | 3,700 | 4,100 |  |
Impairment, Long-Lived Asset, Held-for-Use, Total |  |  | 0 |  |  |
Goodwill, Impairment Loss |  |  | 0 |  |  |
Finite-Lived Patents, Gross |  |  | 2,700 | 2,700 | 2,700 |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  | $ 2,600 | 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, Expected Amortization, Year Four |  |  |  | 100 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Three |  |  |  | 100 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Five |  |  |  | 100 |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  | 8 years |  |  |
Research and Development Expense, Total |  |  | $ 700 | $ 400 |  |
Treasury Stock, Shares, Retired (in shares) | shares | 239,168 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 3 years |  |  |
Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  | 30 years |  |  |
Accounts Receivable [Member] |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  |  | $ 0 |  | 0 |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |
Number of Major Customers |  |  | 0 | 1 |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 11.90% |  |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |
Number of Major Customers |  |  | 0 | 0 |  |
Geographic Distribution, Domestic [Member] |  |  |  |  |  |
Cash and Cash Equivalents, at Carrying Value, Total |  |  | $ 100 | $ 100 | 100 |
Restricted Cash and Cash Equivalents, Total |  |  | 0 | 0 | 0 |
Geographic Distribution, Foreign [Member] |  |  |  |  |  |
Cash and Cash Equivalents, at Carrying Value, Total |  |  | 5,700 | 8,200 | 5,700 |
Restricted Cash and Cash Equivalents, Total |  |  | $ 1,000 | $ 1,600 | $ 1,000 |

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