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Note 7 - Debt Securities - Securities Available-for-sale (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Amortized cost	$ 494,959,000	$ 474,357,000
Gross unrealized gains	18,819,000	5,934,000
Gross unrealized losses	(162,000)	(448,000)
Estimated fair value	513,615,814	479,843,448
US Treasury Securities [Member]
Amortized cost	8,893,000	9,392,000
Gross unrealized gains	387,000	64,000
Gross unrealized losses	0	(4,000)
Estimated fair value	9,280,000	9,452,000
US Government Agencies Debt Securities [Member]
Amortized cost	99,091,000	124,913,000
Gross unrealized gains	5,203,000	1,609,000
Gross unrealized losses	(6,000)	(89,000)
Estimated fair value	104,288,000	126,433,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost	104,063,000	80,295,000
Gross unrealized gains	3,114,000	867,000
Gross unrealized losses	(27,000)	(34,000)
Estimated fair value	107,150,000	81,128,000
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	211,593,000	193,745,000
Gross unrealized gains	5,322,000	1,852,000
Gross unrealized losses	(118,000)	(295,000)
Estimated fair value	216,797,000	195,302,000
Corporate Debt Securities [Member]
Amortized cost	71,319,000	66,012,000
Gross unrealized gains	4,793,000	1,542,000
Gross unrealized losses	(11,000)	(26,000)
Estimated fair value	$ 76,101,000	$ 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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