Note 3 - Investment Securities Available for Sale - Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | ||
| Government-sponsored mortgage-backed securities | $ 72,432 | |
| Government-sponsored mortgage-backed securities | 73,300 | |
| 72,432 | $ 72,965 | |
| 73,300 | 72,370 | |
| Within one year | ||
| Within one year | ||
| After one year through five years | 1,602 | |
| After one year through five years | 1,616 | |
| After five years through ten years | 16,855 | |
| After five years through ten years | 17,515 | |
| After ten years | 7,926 | |
| After ten years | 8,187 | |
| 98,815 | 96,776 | |
| $ 100,618 | $ 96,704 |