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Note 19 - Equity Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted-Average Remaining |  |  | Aggregate |
|  |  |  |  |  | Weighted-Average |  |  | Contractual |  |  | Intrinsic |
|  | Shares |  |  | Exercise Price |  |  | Life (in years) |  |  | Value (in thousands) |
Balance, December 31, 2015 |  |  | 1,031,170 |  |  |  | 31.27 |  |  |  | 0.9 |  |  | $ | 3,268 |
Exercised |  |  | (327,830 | ) |  | $ | 23.37 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (620,670 | ) |  |  | 36.50 |  |  |  |  |  |  |  |  |
Balance, December 31, 2016 |  |  | 82,670 |  |  |  | 23.37 |  |  |  | 1.1 |  |  | $ | 1,211 |
Exercised |  |  | (46,790 | ) |  | $ | 23.37 |  |  |  |  |  |  |  |  |
Balance, December 31, 2017 |  |  | 35,880 |  |  |  | 23.37 |  |  |  | 0.1 |  |  | $ | 675 |
Exercised |  |  | (35,880 | ) |  | $ | 23.37 |  |  |  |  |  |  |  |  |
Balance, December 31, 2018 |  |  | - |  |  |  | - |  |  |  | 0.0 |  |  | $ | - |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | Time-Based RSUs |  |  | Performance-Based RSUs |
|  |  |  |  |  | Weighted-Average |  |  |  |  |  |  | Weighted-Average |
|  |  |  |  |  | Grant Date |  |  |  |  |  |  | Grant Date |
|  | Shares |  |  | Fair Value |  |  | Shares |  |  | Fair Value |
Balance at December 31, 2015 |  |  | 85,111 |  |  |  | 27.55 |  |  |  | 457,264 |  |  |  | 26.84 |
Granted |  |  | 88,693 |  |  |  | 30.37 |  |  |  | 117,679 |  |  |  | 37.22 |
Vested |  |  | (13,780 | ) |  |  | 29.80 |  |  |  | - |  |  |  | - |
Forfeited |  |  | (7,548 | ) |  |  | 29.49 |  |  |  | - |  |  |  | - |
Balance at December 31, 2016 |  |  | 152,476 |  |  |  | 28.89 |  |  |  | 574,943 |  |  |  | 28.96 |
Granted |  |  | 87,781 |  |  |  | 38.59 |  |  |  | 159,264 |  |  |  | 40.36 |
Vested |  |  | (1,167 | ) |  |  | 38.03 |  |  |  | (394,335 | ) |  |  | 39.96 |
Forfeited |  |  | (17,352 | ) |  |  | 33.10 |  |  |  | - |  |  |  | - |
Balance at December 31, 2017 |  |  | 221,738 |  |  |  | 32.72 |  |  |  | 339,872 |  |  |  | 33.52 |
Granted |  |  | 141,810 |  |  |  | 43.30 |  |  |  | 55,455 |  |  |  | 39.46 |
Vested |  |  | (65,721 | ) |  |  | 41.59 |  |  |  | (121,336 | ) |  |  | 37.87 |
Forfeited |  |  | (13,334 | ) |  |  | 35.96 |  |  |  | (8,332 | ) |  |  | 29.61 |
Balance at December 31, 2018 |  |  | 284,493 |  |  |  | 35.79 |  |  |  | 265,659 |  |  |  | 32.90 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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