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Note 8 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2017
Notes Tables |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  | Shares |  | Weighted-Average Grant-Date Fair Value
Non-vested at December 31, 2016 |  |  | 488,779 |  |  | $ | 18.99 |
Granted |  |  | 276,900 |  |  |  | 28.21 |
Vested |  |  | (242,917 | ) |  |  | 21.93 |
Forfeited |  |  | (14,680 | ) |  |  | 21.77 |
Non-vested at March 31, 2017 |  |  | 508,082 |  |  | $ | 22.53 |
Vested but unissued at March 31, 2017 |  |  | 270,017 |  |  | $ | 22.33 |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
|  | For the three months ended March 31,
(In thousands) |  | 2017 |  | 2016
Proceeds from stock options exercised |  | $ | - |  |  | $ | 19 |
Fair value of shares received upon exercised of stock options |  |  | - |  |  |  | 328 |
Tax expense related to stock options exercised |  |  | - |  |  |  | (16 | )
Intrinsic value of stock options exercised |  |  | - |  |  |  | 43 |
Phantom Share Units (PSUs) [Member] |
Notes Tables |
Share-based Compensation, Activity [Table Text Block] |
Phantom Stock Plan |  | Shares |  | Fair Value
Outstanding at December 31, 2016 |  |  | 89,339 |  |  | $ | 29.39 |
Granted |  |  | 6,743 |  |  |  | 27.17 |
Forfeited |  |  | - |  |  |  | - |
Distributions |  |  | (198 | ) |  |  | 28.93 |
Outstanding at March 31, 2017 |  |  | 95,884 |  |  | $ | 26.87 |
Vested at March 31, 2017 |  |  | 95,462 |  |  | $ | 26.87 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&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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