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Note 7 - Debt Securities - Securities Available-for-sale (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Amortized cost	$ 528,166,000	$ 474,357,000
Gross unrealized gains	20,743,000	5,934,000
Gross unrealized losses	(91,000)	(448,000)
Estimated fair value	548,817,733	479,843,448
US Treasury Securities [Member]
Amortized cost	8,492,000	9,392,000
Gross unrealized gains	364,000	64,000
Gross unrealized losses	0	(4,000)
Estimated fair value	8,856,000	9,452,000
US Government Agencies Debt Securities [Member]
Amortized cost	92,650,000	124,913,000
Gross unrealized gains	5,340,000	1,609,000
Gross unrealized losses	(6,000)	(89,000)
Estimated fair value	97,984,000	126,433,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost	130,706,000	80,295,000
Gross unrealized gains	3,140,000	867,000
Gross unrealized losses	(50,000)	(34,000)
Estimated fair value	133,796,000	81,128,000
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	226,574,000	193,745,000
Gross unrealized gains	7,024,000	1,852,000
Gross unrealized losses	(35,000)	(295,000)
Estimated fair value	233,563,000	195,302,000
Corporate Debt Securities [Member]
Amortized cost	69,744,000	66,012,000
Gross unrealized gains	4,875,000	1,542,000
Gross unrealized losses	0	(26,000)
Estimated fair value	$ 74,619,000	$ 67,528,000

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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