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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amortized cost, available for sale securities	$ 136,355	$ 120,068
Gross unrealized gains, available for sale securities	3,952	1,254
Gross unrealized losses, available for sale securities	(82)	(339)
Fair value, available for sale securities	140,225	120,983
Amortized cost, held to maturity securities	14,234	17,627
Gross unrealized gains, held to maturity securities	509	99
Gross unrealized losses, held to maturity securities	0	(80)
Debt Securities, Held-to-maturity, Fair Value, Total	14,743	17,646
Amortized cost, total securities	150,589	137,695
Gross unrealized gains, total securities	4,461	1,353
Gross unrealized losses, total securities	(82)	(419)
Total securities	154,968	138,629
US Agency and Mortgage-backed Securities [Member]
Amortized cost, available for sale securities	98,848	94,461
Gross unrealized gains, available for sale securities	2,830	778
Gross unrealized losses, available for sale securities	(80)	(334)
Fair value, available for sale securities	101,598	94,905
Amortized cost, held to maturity securities	9,588	12,528
Gross unrealized gains, held to maturity securities	264	6
Gross unrealized losses, held to maturity securities	0	(80)
Debt Securities, Held-to-maturity, Fair Value, Total	9,852	12,454
Municipal Bonds [Member]
Amortized cost, available for sale securities	37,507	25,607
Gross unrealized gains, available for sale securities	1,122	476
Gross unrealized losses, available for sale securities	(2)	(5)
Fair value, available for sale securities	38,627	26,078
Amortized cost, held to maturity securities	3,146	3,599
Gross unrealized gains, held to maturity securities	140	81
Gross unrealized losses, held to maturity securities	0	0
Debt Securities, Held-to-maturity, Fair Value, Total	3,286	3,680
Corporate Debt Securities [Member]
Amortized cost, held to maturity securities	1,500	1,500
Gross unrealized gains, held to maturity securities	105	12
Gross unrealized losses, held to maturity securities	0	0
Debt Securities, Held-to-maturity, Fair Value, Total	$ 1,605	$ 1,512

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- Definition

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

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