Note 7 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended		9 Months Ended
	Mar. 02, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2021
Balances	$ 191,751	$ 136,244	$ 191,235	$ 200,607
Unrealized holding gain (loss) on available for sale securities, net of tax	(88,143)
Unrealized holding gain (loss) on available for sale securities, net of tax	(88,143)
Reclassification adjustment, net of tax				(4)
Balances		112,187	190,853	190,853
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balances	2,854	(55,865)	8,089	13,167
Unrealized holding gain (loss) on available for sale securities, net of tax		(29,424)	(3,403)	(8,477)
Unrealized holding gain (loss) on available for sale securities, net of tax		(29,424)	(3,403)	(8,477)
Balances	(85,289)	(85,289)	4,686	4,686
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balances	(6,912)	(6,912)	(10,147)	(10,147)
Balances	(6,912)	(6,912)	(10,147)	(10,147)
AOCI Attributable to Parent [Member]
Balances	(4,058)	(62,777)	(2,058)	3,020
Unrealized holding gain (loss) on available for sale securities, net of tax		(29,424)	(3,403)	(8,477)
Unrealized holding gain (loss) on available for sale securities, net of tax		(29,424)	(3,403)	(8,477)
Balances	$ (92,201)	$ (92,201)	$ (5,461)	$ (5,461)