Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Deferred Tax Assets, Valuation Allowance, Total	$ 1,776	$ (0)
Unrecognized Tax Benefits, Ending Balance	0	0
Income Tax Examination, Penalties and Interest Expense, Total	0	0
California Franchise Tax Board [Member] | State and Local Jurisdiction [Member]
Deferred Tax Assets, Capital Loss Carryforwards	$ 2,673	2,429
Operating Loss Carryforwards, Expiration Period (Year)	5 years
Deferred Tax Assets, Valuation Allowance, Total	$ 1,776	$ 0
Income Tax Examination, Year under Examination	2019 2018 2017 2016