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Note 5 - Stock-Based Compensation (Details) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Restricted Stock Units (RSUs) [Member] Director [Member] | Mar. 13, 2014 Restricted Stock Units (RSUs) [Member] | Mar. 31, 2014 Restricted Stock Units (RSUs) [Member] | Mar. 31, 2013 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2013 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2013 Performance TSR Restricted Stock [Member] | Mar. 31, 2014 Performance TSR Restricted Stock [Member] | Dec. 31, 2013 Performance EPS Restricted Stock Units [Member] | Mar. 31, 2014 Performance EPS Restricted Stock Units [Member] | Mar. 31, 2014 2005 Incentive Plan [Member]
Note 5 - Stock-Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Period Of Common Stock Granted | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Annual Increments To Be Vested In Common Stock Units | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 0 |  | 0 |  |  |  |  |  |  |  |  |  |
Stock or Unit Option Plan Expense (in Dollars) | $ 0 | $ 129,000 |  | $ 350,000 |  | $ 1,000,000 | $ 609,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  |  |  |  |  |  |  |  | 3,073,452
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 13,690 | 4,812 |  |  | 25,037 | 119,840 | 0 | 116,186 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) |  |  |  |  | $ 25.55 |  |  | $ 20.68 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 2 years |  |  | 2 years |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) |  |  |  |  |  | $ 6,300,000 |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  |  | 2 years 6 months |  |  |  |  |  |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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