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Note 4 - Investment Securities - Scheduled Maturities of Investment Securities Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available-for-sale, maturing within one year, amortized cost	$ 259
Available-for-sale, maturing within one year, estimated fair value	261
Held-to-maturity, maturing within one year, amortized cost	122
Held-to-maturity, maturing within one year, estimated fair value	122
Available-for-sale, maturing after one to five years, amortized cost	34,821
Available-for-sale, maturing after one to five years, estimated fair value	34,766
Held-to-maturity, maturing after one to five years, amortized cost	3,397
Held-to-maturity, maturing after one to five years, estimated fair value	3,400
Available-for-sale, maturing after five to ten years, amortized cost	47,803
Available-for-sale, maturing after five to ten years, estimated fair value	47,686
Held-to-maturity, maturing after five to ten years, amortized cost	6,176
Held-to-maturity, maturity after five to ten years, estimated fair value	6,113
Available-for-sale, maturing after ten years, amortized cost	35,527
Available-for-sale, maturing after ten years, estimated fair value	35,248
Held-to-maturity, maturing after ten years, amortized cost	8,993
Held-to-maturity, maturing after ten years, estimated fair value	8,939
Available-for-sale, amortized cost	118,410	$ 135,656
Available-for-sale, estimated fair value	117,961	132,487
Held-to-maturity, amortized cost	18,688	21,462
Held-to-maturity, estimated fair value	$ 18,574	$ 20,852

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