Note 19 - Accumulated Other Comprehensive Income (Loss) - Significant Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income tax benefit	$ 1,435	$ 1,662
Net income	6,748	7,954
Prior service costs	268	252
Actuarial gains	29	22
Net income before income taxes	8,183	9,616
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net income	(331)	137
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Unrealized gains and losses on available-for-sale securities	(687)	(78)
Income tax benefit	144	16
Net income	(543)	(62)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Income tax benefit	(56)	(53)
Net income	212	199
Prior service costs
Actuarial gains	268	252
Net income before income taxes	$ 268	$ 252