Note 16 - Components of Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Reclassification adjustment for gain included in net income, tax		$ 0	$ (1)
Realized gain on available for sale securities, net of tax, reclassified out of accumulated other comprehensive loss		0	(5)
Income tax benefit		(0)	2
Amortization of defined benefit pension items, net of tax, reclassified out of accumulated other comprehensive loss		0	(9)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Realized securities gain, net		0	(6)
Reclassification adjustment for gain included in net income, tax		0	(1)
Realized gain on available for sale securities, net of tax, reclassified out of accumulated other comprehensive loss		0	(5)
Prior service costs(1)	[1]	0	(11)
Income tax benefit		0	(2)
Amortization of defined benefit pension items, net of tax, reclassified out of accumulated other comprehensive loss		$ 0	$ (9)

[1] This accumulated other comprehensive income (loss) component is included in the computation of net periodic benefit cost. (For additional information, see Note 8, Employee Benefit Plans.)