Note 3 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Balance		$ 34,789
Total other comprehensive loss		(21)	$ (58)
Balance		36,945
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	[1]	23	118
Other comprehensive income (loss) before classifications	[1]	(21)	192
Amount reclassified from accumulated other comprehensive income (loss)	[1]	0	(250)
Total other comprehensive loss	[1]	(21)	(58)
Balance	[1]	$ 2	$ 60

[1] All amounts are net of tax. Amounts in parentheses indicate debits.