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Note 2 - Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 2 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 14, 2020 | Jan. 31, 2020 | Jan. 31, 2019 | Feb. 01, 2019
Foreign Currency Transaction Gain (Loss), Realized |  | $ 400 | $ (100) |
Cash and Cash Equivalents, at Carrying Value, Ending Balance |  | 13,371 | 10,156 |
Broker-Dealer, Draft Payable |  | 100 | 200 |
Restricted Cash and Cash Equivalents, Total |  | 1,287 | 2,581 |
Receivables, Long-term Contracts or Programs, Total |  | 2,300 | 4,300 |
Depreciation, Total |  | 4,400 | 4,500 |
Impairment of Long-Lived Assets Held-for-use |  | 0 |  |
Goodwill, Impairment Loss |  | 0 | 0 |
Finite-Lived Patents, Gross |  | 2,700 | 2,600 |
Finite-Lived Intangible Assets, Accumulated Amortization |  | 2,500 | 2,500 |
Finite-Lived Intangible Assets, Amortization Expense, Year Two |  | 100 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three |  | 100 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four |  | 100 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five |  | 100 |  |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five |  | $ 100 |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 4 years 109 days |  |
Research and Development Expense, Total |  | $ 300 | 200 |
Operating Lease, Right-of-Use Asset |  | 11,475 |  |
Operating Lease, Liability, Total |  | 12,254 |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | $ 10,700
Operating Lease, Liability, Total |  |  |  | $ 11,000
Subsequent Event [Member] |  |  |  |
Accounts Receivable, Certified Invoices in Process of Collection | $ 500 |  |  |
Accounts Receivable [Member] |  |  |  |
Accounts Receivable, before Allowance for Credit Loss |  | 4,100 | 4,700 |
Receivables, Long-term Contracts or Programs, Total |  |  | $ 3,600 |
Proceeds from Sale and Collection of Receivables, Total |  | 500 |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  | $ 0 |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |
Concentration Risk, Percentage |  | 13.30% | 42.00% |
Accounts Receivable [Member] | Other Noncurrent Assets [Member] |  |  |  |
Receivables, Long-term Contracts or Programs, Total |  | $ 2,100 | $ 3,500 |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |
Concentration Risk, Percentage |  | 11.50% |  |
Geographic Distribution, Domestic [Member] |  |  |  |
Cash and Cash Equivalents, at Carrying Value, Ending Balance |  | $ 300 | 100 |
Restricted Cash and Cash Equivalents, Total |  | 0 | 1,500 |
Geographic Distribution, Foreign [Member] |  |  |  |
Cash and Cash Equivalents, at Carrying Value, Ending Balance |  | 13,100 | 10,100 |
Restricted Cash and Cash Equivalents, Total |  | $ 1,300 | $ 1,100 |

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