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Note 9 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2019
Notes Tables |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  | RSU Awards |  |  | PRSU Awards |
|  |  |  |  |  | Weighted-Average |  |  |  |  |  |  | Weighted-Average |
|  |  |  |  |  | Grant-Date |  |  |  |  |  |  | Grant-Date |
|  | Shares |  |  | Fair Value |  |  | Shares |  |  | Fair Value |
Non-vested at December 31, 2018 |  |  | 502,658 |  |  | $ | 24.93 |  |  |  | - |  |  | $ | - |
Granted |  |  | 263,574 |  |  |  | 22.38 |  |  |  | 66,130 |  |  |  | 22.38 |
Vested |  |  | (279,187 | ) |  |  | 23.39 |  |  |  | (30,491 | ) |  |  | 22.38 |
Forfeited |  |  | (26,160 | ) |  |  | 24.85 |  |  |  | - |  |  |  | - |
Non-vested at September 30, 2019 |  |  | 460,885 |  |  | $ | 24.41 |  |  |  | 35,639 |  |  | $ | 22.38 |
Vested but unissued at September 30, 2019 |  |  | 229,352 |  |  | $ | 24.67 |  |  |  | 24,691 |  |  | $ | 22.38 |
Phantom Share Units (PSUs) [Member] |
Notes Tables |
Share-based Payment Arrangement, Activity [Table Text Block] |
Phantom Stock Plan |  | Shares |  |  | Fair Value |
Outstanding at December 31, 2018 |  |  | 99,313 |  |  | $ | 21.53 |
Granted |  |  | 10,278 |  |  |  | 21.97 |
Distributions |  |  | (1,055 | ) |  |  | 21.91 |
Outstanding at September 30, 2019 |  |  | 108,536 |  |  | $ | 20.20 |
Vested at September 30, 2019 |  |  | 108,228 |  |  | $ | 20.20 |

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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