Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards		$ 9,600
Deferred Tax Assets, Operating Loss Carryforwards, Total		5,916	$ 8,732
Deferred Tax Assets, Tax Credit Carryforwards, Other		7,500
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax		1,000
Income Taxes Receivable		16,700	$ 41,100
Domestic Tax Authority [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Total		2,020
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year	2017 2018 2019 2020 2021
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforwards		39,400
Deferred Tax Assets, Operating Loss Carryforwards, Total		$ 3,900