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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Amortized cost, available for sale securities	$ 112,923	$ 120,068
Gross unrealized gains, available for sale securities	4,223	1,254
Gross unrealized losses, available for sale securities	(14)	(339)
Fair value, available for sale securities	117,132	120,983	[1]
Amortized cost, held to maturity securities	15,101	17,627	[1]
Gross unrealized gains, held to maturity securities	537	99
Gross unrealized losses, held to maturity securities	0	(80)
Debt Securities, Held-to-maturity, Fair Value, Total	15,638	17,646	[1]
Amortized cost, total securities	128,024	137,695
Gross unrealized gains, total securities	4,760	1,353
Gross unrealized losses, total securities	(14)	(419)
Total securities	132,770	138,629
US Agency and Mortgage-backed Securities [Member]
Amortized cost, available for sale securities	84,217	94,461
Gross unrealized gains, available for sale securities	3,260	778
Gross unrealized losses, available for sale securities	(14)	(334)
Fair value, available for sale securities	87,463	94,905
Amortized cost, held to maturity securities	10,450	12,528
Gross unrealized gains, held to maturity securities	302	6
Gross unrealized losses, held to maturity securities	0	(80)
Debt Securities, Held-to-maturity, Fair Value, Total	10,752	12,454
Municipal Bonds [Member]
Amortized cost, available for sale securities	28,706	25,607
Gross unrealized gains, available for sale securities	963	476
Gross unrealized losses, available for sale securities	0	(5)
Fair value, available for sale securities	29,669	26,078
Amortized cost, held to maturity securities	3,151	3,599
Gross unrealized gains, held to maturity securities	150	81
Gross unrealized losses, held to maturity securities	0	0
Debt Securities, Held-to-maturity, Fair Value, Total	3,301	3,680
Corporate Debt Securities [Member]
Amortized cost, held to maturity securities	1,500	1,500
Gross unrealized gains, held to maturity securities	85	12
Gross unrealized losses, held to maturity securities	0	0
Debt Securities, Held-to-maturity, Fair Value, Total	$ 1,585	$ 1,512
[1] Derived from audited consolidated financial statements.

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The total amount of available-for-sale and held-to-maturity debt securities measured at amortized cost.

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