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Note 2 - Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2021 | Jan. 31, 2020
Foreign Currency Transaction Gain (Loss), Realized | $ 100 | $ 400
Cash and Cash Equivalents, at Carrying Value, Ending Balance | 7,174 | 13,371
Broker-Dealer, Draft Payable | 100 | 100
Restricted Cash and Cash Equivalents, Total | 1,201 | 1,287
Receivables, Long-term Contracts or Programs, Total | 2,700 | 2,600
Depreciation, Total | 4,700 | 4,400
Impairment of Long-Lived Assets Held-for-use | 0 | 0
Goodwill, Impairment Loss | 0 | 0
Finite-Lived Patents, Gross | 2,600 | 2,700
Finite-Lived Intangible Assets, Accumulated Amortization | 2,500 | 2,500
Amortization of Intangible Assets, Total | 100 |
Finite-Lived Intangible Asset, Expected Amortization, Year One | 100 |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | $ 100 |
Finite-Lived Intangible Asset, Useful Life (Year) | 2 years 292 days |
Research and Development Expense, Total | $ 300 | 300
Finite-Lived Intangible Asset, Expected Amortization, Year Two | 100 |
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 |
Accounts Receivable [Member] |  |
Accounts Receivable, before Allowance for Credit Loss | 3,800 | $ 4,100
Receivables, Long-term Contracts or Programs, Total | 3,400 |
Proceeds from Sale and Collection of Receivables, Total | 200 |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 0 |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |
Concentration Risk, Percentage |  | 13.30%
Accounts Receivable [Member] | Other Noncurrent Assets [Member] |  |
Receivables, Long-term Contracts or Programs, Total | 2,400 | $ 2,100
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 | 100 | $ 300
Restricted Cash and Cash Equivalents, Total | 0 | 0
Geographic Distribution, Foreign [Member] |  |
Cash and Cash Equivalents, at Carrying Value, Ending Balance | 7,100 | 13,100
Restricted Cash and Cash Equivalents, Total | $ 1,200 | $ 1,300

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