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Note 12 - Equity Incentive Plan (Details Textual) - USD ($) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 18, 2013 | Jun. 07, 2011 | Jun. 05, 2009 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 04, 2003
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  | 0.9 |  |  |
Allocated Share-based Compensation Expense |  |  |  | $ 3,392,000 | $ 2,225,000 | $ 1,607,000 |
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Vested and Expected to Vest Outstanding Number |  |  |  | 903,076 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Vested and Expected to Vest Outstanding Weighted Average Exercise Price |  |  |  | $ 24.92 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Ppreciation Rights Vested and Expected to Vest Outstanding Aggregate Intrinsic Value |  |  |  | $ 21.70 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding, Weighted Average Remaining ContractualTerm |  |  |  | 6 years 292 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Vested Aggregate Intrinsic Value |  |  |  | $ 16,700,000 | 11,600,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding, Intrinsic Value |  |  |  | 22,300,000 | 15,200,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercises in Period, Total Intrinsic Value |  |  |  | 2,100,000 | 3,100,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Vested in Period Fair Value |  |  |  | 1,300,000 | 1,100,000 |  |
Proceeds from Stock Options Exercised |  |  |  | $ 1,007,000 | 1,074,000 | 2,055,000 |
Employee Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement Evaluation of Expected Volatility Assumption to Historical Volatility Average Period |  |  |  | 4 years |  |  |
Stock Options, SARs and Restricted Stock Awards [Member] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  | $ 3,400,000 | 2,200,000 | 1,600,000 |
Stock Options and SARs [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 979,569 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  |  | $ 5,000,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 2 years 292 days |  |  |
Incentive Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number |  |  |  | 144,316 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price |  |  |  | $ 10.22 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  | 4 years 255 days |  |  |
Non-qualified Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number |  |  |  | 281,093 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price |  |  |  | $ 15.61 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  | 5 years 255 days |  |  |
Performance Shares [Member] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  | $ 300,000 | 400,000 | $ 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number |  |  |  | 7,065 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price |  |  |  | $ 39.69 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  | 8 years 36 days |  |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number |  |  |  | 40,250 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price |  |  |  | $ 6.94 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  | 2 years 292 days |  |  |
Restricted Stock and Restricted Stock Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  | $ 1,000,000 | $ 1,200,000 |  |
Amended Two Thousand Three Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 3,800,000 |  | 2,350,000 |  |  |  | 1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 650,000 |  | 850,000 |  |  |  |
Number of Shares Available for Grant Reduced By Each Share Award Issued Other Than Options or SARs | 1.5 |  |  |  |  |  |
Second Amended Two Thousand Three Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  | 3,150,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  | 800,000 |  |  |  |  |
Number of Shares Available for Grant Reduced By Each Share Award Issued Other Than Options or SARs |  | 1.9 |  |  |  |  |
Two Thousand Three Plan [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 1 year |  |  |
Two Thousand Three Plan [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 4 years |  |  |

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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 Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(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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