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Note 4 - Investment Securities - Scheduled Maturities of Investment Securities Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale, maturing within one year, amortized cost	$ 1,351
Available-for-sale, maturing within one year, estimated fair value	1,351
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	38,063
Available-for-sale, maturing after one to five years, estimated fair value	37,271
Held-to-maturity, maturing after one to five years, amortized cost	1,116
Held-to-maturity, maturing after one to five years, estimated fair value	1,106
Available-for-sale, maturing after five to ten years, amortized cost	59,244
Available-for-sale, maturing after five to ten years, estimated fair value	57,214
Held-to-maturity, maturing after five to ten years, amortized cost	7,564
Held-to-maturity, maturity after five to ten years, estimated fair value	7,327
Available-for-sale, maturing after ten years, amortized cost	42,442
Available-for-sale, maturing after ten years, estimated fair value	41,422
Held-to-maturity, maturing after ten years, amortized cost	13,558
Held-to-maturity, maturing after ten years, estimated fair value	13,046
Available-for-sale, amortized cost	141,100	$ 155,473
Available-for-sale, estimated fair value	137,258	153,871
Held-to-maturity, amortized cost	22,238	26,279
Held-to-maturity, estimated fair value	$ 21,479	$ 25,949

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