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Note 6 - Acquisitions (Details Textual) - USD ($) $ in Millions |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 19, 2022 | Aug. 19, 2021 | Jul. 24, 2020 | Jan. 10, 2019 | Dec. 31, 2021 | Dec. 31, 2020
Spell Security [Member] |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  | $ 1.5 |  |  |
Business Combination, Contingent Consideration, Liability, Total |  |  | 0.2 |  |  |
Adya [Member] |  |  |  |  |  |
Business Combination, Consideration Transferred, Total |  |  |  | $ 1.0 |  |
Payment for Contingent Consideration Liability, Investing Activities |  |  |  | $ 0.2 |  |
Goodwill, Deductible for Tax Purpose Period (Year) |  |  |  | 15 years |  |
Developed Technology Rights [Member] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  | $ 1.2 |  |  |  |
Payments to Acquire Intangible Assets |  | $ 1.1 | 1.3 |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 5 years |  |  | 4 years 6 months | 4 years 4 months 24 days
Developed Technology Rights [Member] | Spell Security [Member] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 1.0 |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year) |  |  | 4 years |  |  |
Developed Technology Rights [Member] | Adya [Member] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  | 4 years |  |
Developed Technology Rights [Member] | Forecast [Member] |  |  |  |  |  |
Payments to Acquire Intangible Assets | $ 0.1 |  |  |  |  |
Noncompete Agreements [Member] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  |  | 2 years | 2 years
Noncompete Agreements [Member] | Spell Security [Member] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 0.5 |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year) |  |  | 2 years |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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