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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