Note 9 - Income Taxes - Components of Income Tax Expense (Benefits) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Federal									$ 42	$ (147)
State and local									177	209
Total current tax expense									219	62
Federal									83	(1,411)
State and local									(1)	(180)
Total before change in valuation allowance									82	(1,591)
Change in valuation allowance									0	0
Net deferred tax expense (benefit)									82	(1,591)
Income tax provision (benefit)	$ 169	$ 69	$ (2)	$ 65	$ (164)	$ (611)	$ (588)	$ (166)	$ 301	$ (1,529)