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Note 12 - Equity Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | For the years ended December 31, |
(in thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
RSU expense before taxes of the Plan |  | $ | 965 |  |  | $ | 643 |  |  | $ | 560 |
RSU expense after taxes |  |  | 704 |  |  |  | 471 |  |  |  | 636 |
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] |
|  | 2019 |  |  | 2018 |  |  | 2017 |
|  | Number of Shares |  |  | Weighted Average Estimated Fair Value |  |  | Number of Shares |  |  | Weighted Average Estimated Fair Value |  |  | Number of Shares |  |  | Weighted Average Estimated Fair Value |
Beginning balance |  |  | 527,546 |  |  | $ | 20.65 |  |  |  | 469,069 |  |  | $ | 20.11 |  |  |  | 421,486 |  |  | $ | 19.93 |
Granted |  |  | 207,521 |  |  |  | 16.36 |  |  |  | 84,283 |  |  |  | 22.33 |  |  |  | 73,021 |  |  |  | 20.01 |
Converted into shares |  |  | (96,845 | ) |  |  | 20.59 |  |  |  | (19,097 | ) |  |  | 16.09 |  |  |  | (25,438 | ) |  |  | 16.71 |
Forfeited |  |  | (2,136 | ) |  |  | 22.80 |  |  |  | (6,709 | ) |  |  | 16.98 |  |  |  | - |  |  |  | - |
Outstanding at December 31 |  |  | 636,086 |  |  | $ | 19.25 |  |  |  | 527,546 |  |  | $ | 20.65 |  |  |  | 469,069 |  |  | $ | 20.11 |
Vested at December 31 |  |  | 419,721 |  |  | $ | 20.37 |  |  |  | 436,069 |  |  | $ | 20.42 |  |  |  | 403,428 |  |  | $ | 19.89 |

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