Note 3 - Investment Securities - Debt Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Held-to-maturity Securities, Less than 12 Months, Fair Value |
$ 20,828
|
$ 5,956
|
| Held-to-maturity Securities, Less than 12 Months, Unrealized Losses |
462
|
54
|
| Held-to-maturity Securities, 12 Months or More, Fair Value |
|
|
| Held-to-maturity Securities, 12 Months or More, Unrealized Losses |
|
|
| Held-to-maturity Securities, Total Fair Value |
20,828
|
5,956
|
| Held-to-maturity Securities, Total Unrealized Losses |
462
|
54
|
| Available-for-sale Securities, Less than 12 Months, Fair Value |
25,662
|
29,104
|
| Available-for-sale Securities, Less than 12 Months, Unrealized Losses |
335
|
129
|
| Available-for-sale Securities, 12 Months or More, Fair Value |
|
3,654
|
| Available-for-sale Securities, 12 Months or More, Unrealized Losses |
|
59
|
| Available-for-sale Securities, Total Fair Value |
25,662
|
32,758
|
| Available-for-sale Securities, Total Unrealized Losses |
335
|
188
|
| Collateralized Mortgage Backed Securities [Member] |
|
|
| Held-to-maturity Securities, Less than 12 Months, Fair Value |
3,286
|
3,960
|
| Held-to-maturity Securities, Less than 12 Months, Unrealized Losses |
29
|
16
|
| Held-to-maturity Securities, 12 Months or More, Fair Value |
|
|
| Held-to-maturity Securities, 12 Months or More, Unrealized Losses |
|
|
| Held-to-maturity Securities, Total Fair Value |
3,286
|
3,960
|
| Held-to-maturity Securities, Total Unrealized Losses |
29
|
16
|
| Available-for-sale Securities, Less than 12 Months, Fair Value |
18,606
|
28,606
|
| Available-for-sale Securities, Less than 12 Months, Unrealized Losses |
256
|
128
|
| Available-for-sale Securities, 12 Months or More, Fair Value |
|
3,654
|
| Available-for-sale Securities, 12 Months or More, Unrealized Losses |
|
59
|
| Available-for-sale Securities, Total Fair Value |
18,606
|
32,260
|
| Available-for-sale Securities, Total Unrealized Losses |
256
|
187
|
| US Government Agencies Debt Securities [Member] |
|
|
| Available-for-sale Securities, Less than 12 Months, Fair Value |
3,617
|
|
| Available-for-sale Securities, Less than 12 Months, Unrealized Losses |
36
|
|
| Available-for-sale Securities, 12 Months or More, Fair Value |
|
|
| Available-for-sale Securities, 12 Months or More, Unrealized Losses |
|
|
| Available-for-sale Securities, Total Fair Value |
3,617
|
|
| Available-for-sale Securities, Total Unrealized Losses |
36
|
|
| US States and Political Subdivisions Debt Securities [Member] |
|
|
| Held-to-maturity Securities, Less than 12 Months, Fair Value |
17,542
|
1,996
|
| Held-to-maturity Securities, Less than 12 Months, Unrealized Losses |
433
|
38
|
| Held-to-maturity Securities, 12 Months or More, Fair Value |
|
|
| Held-to-maturity Securities, 12 Months or More, Unrealized Losses |
|
|
| Held-to-maturity Securities, Total Fair Value |
17,542
|
1,996
|
| Held-to-maturity Securities, Total Unrealized Losses |
433
|
38
|
| Available-for-sale Securities, Less than 12 Months, Fair Value |
951
|
498
|
| Available-for-sale Securities, Less than 12 Months, Unrealized Losses |
31
|
1
|
| Available-for-sale Securities, 12 Months or More, Fair Value |
|
|
| Available-for-sale Securities, 12 Months or More, Unrealized Losses |
|
|
| Available-for-sale Securities, Total Fair Value |
951
|
498
|
| Available-for-sale Securities, Total Unrealized Losses |
31
|
$ 1
|
| Asset-backed Securities [Member] |
|
|
| Available-for-sale Securities, Less than 12 Months, Fair Value |
2,488
|
|
| Available-for-sale Securities, Less than 12 Months, Unrealized Losses |
12
|
|
| Available-for-sale Securities, 12 Months or More, Fair Value |
|
|
| Available-for-sale Securities, 12 Months or More, Unrealized Losses |
|
|
| Available-for-sale Securities, Total Fair Value |
2,488
|
|
| Available-for-sale Securities, Total Unrealized Losses |
$ 12
|
|