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Note 10 - Stock Based Compensation (Details) (USD $) | 12 Months Ended |  | 12 Months Ended | 120 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Pro Forma [Member] | Dec. 31, 2013 Attainment Level 1 [Member] Performance RSU [Member] | Dec. 31, 2013 Attainment Level 1 [Member] Restricted Stock Units (RSUs) [Member] 2013 Stock Incentive Plan [Member] | Dec. 31, 2013 Attainment Level 1 [Member] Restricted Stock Units (RSUs) [Member] | Dec. 31, 2013 Restricted Stock [Member] 2013 Stock Incentive Plan [Member] Maximum [Member] | Dec. 31, 2013 Time-vesting RSU [Member] 2013 Stock Incentive Plan [Member] | Dec. 31, 2013 Performance and Time-vesting RSUs [Member] 2013 Stock Incentive Plan [Member] | Dec. 31, 2013 Performance and Time-vesting RSUs [Member] 2013 Stock Incentive Plan [Member] Minimum [Member] | Dec. 31, 2013 Performance and Time-vesting RSUs [Member] | Dec. 31, 2013 Performance and Time-vesting RSUs [Member] Maximum [Member] | Dec. 31, 2013 Performance and Time-vesting RSUs [Member] Minimum [Member] | Dec. 31, 2013 Performance RSU [Member] 2013 Stock Incentive Plan [Member] | Dec. 31, 2013 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2013 Employee Stock Option [Member] 2013 Stock Incentive Plan [Member] | Dec. 31, 2013 Employee Stock Option [Member] 2013 Stock Incentive Plan [Member] | Dec. 31, 2013 Employee Stock Option [Member] 2013 Stock Incentive Plan [Member] Maximum [Member] | Dec. 31, 2013 Employee Stock Option [Member] | Dec. 31, 2013 2009 ESPP [Member] Net of Discount [Member] | Dec. 31, 2013 2009 ESPP [Member] Per Share Discount [Member] | Dec. 31, 2012 2009 ESPP [Member] Per Share Discount [Member] | Dec. 31, 2011 2009 ESPP [Member] Per Share Discount [Member] | Dec. 31, 2013 2009 ESPP [Member] | Dec. 31, 2013 2013 Stock Incentive Plan [Member]
Note 10 - Stock Based Compensation (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 | 3,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount of Stock per Employee (in Dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77,005 |
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49.94 | $ 8.81 | $ 4.29 | $ 2.56 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 604,288 | 1,573,080
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  | 6 years |  |  | 4 years |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  |  |  |  |  |  |  |  | 77,736 | 52,820 |  |  |  |  | 108,768 |  |  |  |  |  |  |  |  |  |  |
Attainment Level |  |  |  |  | 33.00% | 33.00% |  |  |  | 100.00% |  |  | 100.00% | 30.00% |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted (in Dollars per share) | $ 4.05 | $ 3.07 | $ 2.21 | $ 4.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Allocated Share Based Compensation Expense (in Dollars) |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 |  |  |  | 4,700,000 |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) | 6,600,000 | 3,100,000 | 2,300,000 |  |  |  |  |  |  |  |  | 500,000 |  |  |  | 2,400,000 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award,Attainment Level of Earnings per Share (in Dollars per share) |  |  |  |  | $ 4.00 |  | $ 4.00 |  |  |  |  |  | $ 3.53 | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years | 6 years |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options (in Dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,200,000 |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 328 days |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Discount rate from fair value on offering date that participants pay for shares. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the 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 -URI http://asc.fasb.org/extlink&oid=6415400&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 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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