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Note 11 - Equity Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | For the years ended December 31, |
(in thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
RSU expense before taxes of New Plan |  | $ | 643 |  |  | $ | 560 |  |  | $ | 42 |
RSU (income) expense before taxes of Old Plan |  |  | - |  |  |  | - |  |  |  | (73 | )
RSU (income) expense after taxes |  |  | 471 |  |  |  | 636 |  |  |  | 81 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Estimated Fair Value |
Outstanding at December 31, 2017 |  |  | 469,069 |  |  | $ | 20.11 |
Granted |  |  | 84,283 |  |  |  | 22.33 |
Converted into shares |  |  | (19,097 | ) |  |  | 16.09 |
Forfeited |  |  | (6,709 | ) |  |  | 16.98 |
Outstanding at December 31, 2018 |  |  | 527,546 |  |  | $ | 20.65 |
Vested at December 31, 2018 |  |  | 436,069 |  |  | $ | 20.42 |

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