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, 2019	Dec. 31, 2018
Provision for income taxes	$ (1,662)	$ (633)
Total security reclassifications for the period	(7,954)	(4,211)
Other noninterest income	(1,476)	(1,766)
Compensation and employee benefits	(11,738)	(10,320)
Total before tax	(9,616)	(4,844)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Total security reclassifications for the period	137	206
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	(78)	9
Provision for income taxes	16	(2)
Total security reclassifications for the period	(62)	7
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
Other noninterest income
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Compensation and employee benefits	252	252
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Provision for income taxes	(53)	(53)
Total security reclassifications for the period	199	199
Total before tax	$ 252	$ 252