Note 9 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Balance	$ 80,202	$ 86,662	$ 96,959	$ 93,233	$ 90,870	$ 91,480	$ 96,959	$ 91,480
Net current period other comprehensive income (loss)	(7,299)	(7,848)	(12,005)	(1,463)	1,228	(2,080)
Balance	70,975	80,202	86,662	94,440	93,233	90,870	70,975	94,440
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(19,959)		(106)	1,368		2,220	(106)	2,220
Other comprehensive income before reclassification	(7,442)			(1,329)			(27,369)	(2,157)
Amounts reclassified from accumulated other comprehensive income (loss)	143			(134)			217	(158)
Net current period other comprehensive income (loss)	(7,299)			(1,463)			(27,152)	(2,315)
Balance	(27,258)	(19,959)		(95)	1,368		(27,258)	(95)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(5,071)		(5,071)	(5,704)		(5,704)	(5,071)	(5,704)
Other comprehensive income before reclassification	0			0			0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0			0			0	0
Net current period other comprehensive income (loss)	0			0			0	0
Balance	(5,071)	(5,071)		(5,704)	(5,704)		(5,071)	(5,704)
AOCI Attributable to Parent [Member]
Balance	(25,030)	(17,182)	(5,177)	(4,336)	(5,564)	(3,484)	(5,177)	(3,484)
Other comprehensive income before reclassification	(7,442)			(1,329)			(27,369)	(2,157)
Amounts reclassified from accumulated other comprehensive income (loss)	143			(134)			217	(158)
Net current period other comprehensive income (loss)	(7,299)	(7,848)	(12,005)	(1,463)	1,228	(2,080)	(27,152)	(2,315)
Balance	$ (32,329)	$ (25,030)	$ (17,182)	$ (5,799)	$ (4,336)	$ (5,564)	$ (32,329)	$ (5,799)