Note 7 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details) (Parentheticals) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended		9 Months Ended
	Mar. 02, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2021
Unrealized holding gain (loss) on available for sale securities, tax	$ (23,431)
Unrealized holding gain (loss) on available for sale securities, tax	$ (23,431)
Reclassification adjustment for gain included in net income, taxes				$ (1)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Unrealized holding gain (loss) on available for sale securities, tax		$ (7,822)	$ (905)	(2,254)
Unrealized holding gain (loss) on available for sale securities, tax		(7,822)	(905)	(2,254)
AOCI Attributable to Parent [Member]
Unrealized holding gain (loss) on available for sale securities, tax		(7,822)	(905)	(2,254)
Unrealized holding gain (loss) on available for sale securities, tax		$ (7,822)	$ (905)	$ (2,254)