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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Unbilled Receivables, Expected Billing Period (Year) |  | 1 year |  |
Nonqualified Stock Option, Contractual Term (Year) |  | 10 years |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  | 4 years |
Research and Development Expense, Total |  | $ 36.8 | $ 43.1 | $ 47.1
Advertising Expense |  | $ 11.9 | $ 14.7 | $ 12.0
Restricted Stock [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  | 4 years |  |
First Option to Extend Corporate Headquarters [Member] |  |  |  |
Lessee, Leases, Number of Extensions |  | 1 |  |
Lessee, Lease, Extension Lease Term (Year) |  | 10 years |  | 10 years
Second Option to Extend Corporate Headquarters [Member] |  |  |  |
Lessee, Leases, Number of Extensions |  | 2 |  |
Lessee, Lease, Extension Lease Term (Year) |  | 5 years | 5 years |
Verisk Financial Services [Member] | Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] |  |  |  |
Impairment of Long-Lived Assets to be Disposed of | $ 73.7 |  |  | $ 134.0
Impairment of Intangible Assets (Excluding Goodwill), Total |  |  |  | 88.2
Tangible Asset Impairment Charges, Total |  |  |  | $ 45.8

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