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Note 8 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2018
Notes Tables |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  |  |  | Weighted-Average
|  |  |  | Grant-Date
|  | Shares |  | Fair Value
Non-vested at December 31, 2017 |  |  | 497,322 |  |  | $ | 22.46 |
Granted |  |  | 274,990 |  |  |  | 28.21 |
Vested |  |  | (238,249 | ) |  |  | 23.64 |
Forfeited |  |  | (6,005 | ) |  |  | 25.24 |
Non-vested at March 31, 2018 |  |  | 528,058 |  |  | $ | 24.89 |
Vested but unissued at March 31, 2018 |  |  | 233,449 |  |  | $ | 25.15 |
Phantom Share Units (PSUs) [Member] |
Notes Tables |
Share-based Compensation, Activity [Table Text Block] |
Phantom Stock Plan |  | Shares |  | Fair Value
Outstanding at December 31, 2017 |  |  | 89,180 |  |  | $ | 27.50 |
Granted |  |  | 8,200 |  |  |  | 27.90 |
Forfeited |  |  | - |  |  |  | - |
Distributions |  |  | (24 | ) |  |  | 27.57 |
Outstanding at March 31, 2018 |  |  | 97,356 |  |  | $ | 26.96 |
Vested at March 31, 2018 |  |  | 96,509 |  |  | $ | 26.96 |

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, 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=109197908&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=109197908&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=109197908&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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