Note 1 - Summary of Significant Accounting Policies - Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Net income | $ 2,545 | $ 4,324 | $ 3,556 | $ 6,180 | $ 3,584 | $ 3,832 | $ 3,502 | $ 4,074 | $ 16,605 | $ 14,992 | $ 16,459 |
| Less preferred stock dividends and discount accretion | 170 | 225 | 395 | 1,927 | |||||||
| Net income available to common shareholders, basic and diluted | $ 2,545 | $ 4,324 | $ 3,556 | $ 6,180 | $ 3,584 | $ 3,832 | $ 3,332 | $ 3,849 | $ 16,605 | $ 14,597 | $ 14,532 |
| Average common shares outstanding, basic and diluted (in shares) | 7,508 | 7,505 | 7,502 | 7,500 | 7,497 | 7,495 | 7,492 | 7,490 | 7,504 | 7,494 | 7,483 |
| Net income per common share, basic and diluted (in dollars per share) | $ 0.34 | $ 0.58 | $ 0.47 | $ 0.82 | $ 0.48 | $ 0.51 | $ 0.44 | $ 0.51 | $ 2.21 | $ 1.95 | $ 1.94 |