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				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Balance	$ 86,662	$ 96,959	$ 90,870	$ 91,480	$ 96,959	$ 91,480
Net current period other comprehensive income (loss)	(7,848)	(12,005)	1,228	(2,080)
Balance	80,202	86,662	93,233	90,870	80,202	93,233
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Balance	(12,111)	(106)	140	2,220	(106)	2,220
Other comprehensive income before reclassification	(7,929)		1,231		(19,927)	(829)
Amounts reclassified from accumulated other comprehensive income (loss)	81		(3)		74	(23)
Net current period other comprehensive income (loss)	(7,848)		1,228		(19,853)	(852)
Balance	(19,959)	(12,111)	1,368	140	(19,959)	1,368
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	(17,182)	(5,177)	(5,564)	(3,484)	(5,177)	(3,484)
Other comprehensive income before reclassification	(7,929)		1,231		(19,927)	(829)
Amounts reclassified from accumulated other comprehensive income (loss)	81		(3)		74	(23)
Net current period other comprehensive income (loss)	(7,848)	(12,005)	1,228	(2,080)	(19,853)	(852)
Balance	$ (25,030)	$ (17,182)	$ (4,336)	$ (5,564)	$ (25,030)	$ (4,336)