Note 19 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Balance	$ 80,008	$ 59,091
Net current period other comprehensive income (loss)	1,022	(652)
Cumulative effect of change in accounting principle, net of tax	(181)
Balance, as adjusted	79,827	59,091
Balance	85,858	80,008
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance	(1,517)	(679)
Other comprehensive income before reclassification	1,471	(658)
Amounts reclassified from accumulated other comprehensive income (loss)	(62)	7
Net current period other comprehensive income (loss)	1,409	(651)
Cumulative effect of change in accounting principle, net of tax		(187)
Balance, as adjusted		(866)
Balance	(108)	(1,517)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(4,840)	(4,839)
Other comprehensive income before reclassification	(586)	(200)
Amounts reclassified from accumulated other comprehensive income (loss)	199	199
Net current period other comprehensive income (loss)	(387)	(1)
Cumulative effect of change in accounting principle, net of tax
Balance, as adjusted		(4,839)
Balance	(5,227)	(4,840)
AOCI Attributable to Parent [Member]
Balance	(6,357)	(5,518)
Other comprehensive income before reclassification	885	(858)
Amounts reclassified from accumulated other comprehensive income (loss)	137	206
Net current period other comprehensive income (loss)	1,022	(652)
Cumulative effect of change in accounting principle, net of tax		(187)
Balance, as adjusted	(6,357)	(5,705)
Balance	$ (5,335)	$ (6,357)