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Note 3 - Investment Securities - Scheduled Maturities of Investment Securities Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale, maturing within one year, amortized cost	$ 699
Available-for-sale, maturing within one year, estimated fair value	707
Held-to-maturity, maturing within one year, amortized cost
Held-to-maturity, maturing within one year, estimated fair value
Available-for-sale, maturing after one to five years, amortized cost	22,234
Available-for-sale, maturing after one to five years, estimated fair value	21,719
Held-to-maturity, maturing after one to five years, amortized cost	1,827
Held-to-maturity, maturing after one to five years, estimated fair value	1,813
Available-for-sale, maturing after five to ten years, amortized cost	80,332
Available-for-sale, maturing after five to ten years, estimated fair value	78,419
Held-to-maturity, maturing after five to ten years, amortized cost	4,293
Held-to-maturity, maturity after five to ten years, estimated fair value	4,217
Available-for-sale, maturing after ten years, amortized cost	56,873
Available-for-sale, maturing after ten years, estimated fair value	55,797
Held-to-maturity, maturing after ten years, amortized cost	19,180
Held-to-maturity, maturing after ten years, estimated fair value	18,657
Available-for-sale, amortized cost	160,138	$ 155,473
Available-for-sale, estimated fair value	156,642	153,871
Held-to-maturity, amortized cost	25,300	26,279
Held-to-maturity, estimated fair value	$ 24,687	$ 25,949

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