Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets, Operating Loss Carryforwards	$ 3,787	$ 5,916
Deferred Tax Assets, Tax Credit Carryforwards, Other	7,500
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	1,000
Income Taxes Receivable	33,700	$ 16,700
Tax Credit Carryforward, Amount	15,900
Domestic Tax Authority [Member]
Operating Loss Carryforwards	2,300
Deferred Tax Assets, Operating Loss Carryforwards	$ 500
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year	2020 2021 2022 2023
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforwards	$ 33,500
Deferred Tax Assets, Operating Loss Carryforwards	$ 3,300
Open Tax Year	2019 2020 2021 2022 2023