Note 14 - Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Balance	$ 443,232	$ 440,701	$ 409,702	$ 406,297	$ 440,701	$ 406,297
Balance	651,089	443,232	420,231	409,702	651,089	420,231
Net current period other comprehensive income (loss)	4,840	(11,791)	2,364	5,775	(6,951)	8,139
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Balance	(2,513)	9,310	7,123	1,085	9,310	1,085
Net current period other comprehensive income (loss)	4,808				(7,015)
Balance	2,295	(2,513)	9,466	7,123	2,295	9,466
Net current period other comprehensive income (loss)			2,343			8,381
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Balance	(90)	(122)	(302)	(39)	(122)	(39)
Net current period other comprehensive income (loss)	32				64
Balance	(58)	(90)	(281)	(302)	(58)	(281)
Net current period other comprehensive income (loss)			21			(242)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(447)	(447)	(369)	(369)	(447)	(369)
Net current period other comprehensive income (loss)	0				0
Balance	(447)	(447)	(369)	(369)	(447)	(369)
Net current period other comprehensive income (loss)			0			0
AOCI Attributable to Parent [Member]
Balance	(3,050)	8,741	6,452	677	8,741	677
Net current period other comprehensive income (loss)	4,840				(6,951)
Balance	1,790	(3,050)	8,816	6,452	$ 1,790	8,816
Net current period other comprehensive income (loss)	$ 4,840	$ (11,791)	$ 2,364	$ 5,775		$ 8,139