Note 15 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount	$ 700
Capitalized Costs, Research and Development	$ 22,900	$ 23,400
Finite-Lived Intangible Asset, Useful Life (Year)	13 years	13 years
Unrecognized Tax Benefits, Ending Balance	$ 0	$ 0
Open Tax Year	2019 2020 2021 2022 2023
Domestic Tax Authority [Member] | In Process Research and Development [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	$ 0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	18,100
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Research Tax Credit Carryforward [Member]
Operating Loss Carryforwards	0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	1,000
Foreign Tax Authority [Member]
Deferred Tax Liabilities, Undistributed Foreign Earnings	$ 600
Foreign Tax Authority [Member] | In Process Research and Development [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	15 years
Foreign Tax Authority [Member] | Ministry of Economic Affairs and Finance, Italy [Member]
Operating Loss Carryforwards	$ 4,700