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Note 10 - Stock-based Compensation (Details Textual) | 12 Months Ended | 144 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 shares
Two Thousand Thirteen Stock Incentive Plan [Member] | Stock Appreciation Rights (SARs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | 0 | 0 |
Two Thousand Thirteen Stock Incentive Plan [Member] | Restricted Stock [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |
Two Thousand Thirteen Stock Incentive Plan [Member] | Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | 0 | 0 |
Two Thousand Thirteen Stock Incentive Plan [Member] | Time Vesting RSU [Member] |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 34,903 |  |
Two Thousand Thirteen Stock Incentive Plan [Member] | Performance and Time Vestings RSU's [Member] |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 85,290 |  |
Two Thousand Thirteen Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 50,992 |  |
Weighted Average Attainment Level for Performance and Time Vesting RSUs | 72.00% |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ | $ 10,300,000 | $ 10,300,000 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 109 days |  |
Two Thousand Thirteen Stock Incentive Plan [Member] | Employee Stock Option [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 5 years |  |
Two Thousand Thirteen Stock Incentive Plan [Member] | Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years | 6 years |
Two Thousand Thirteen Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 3,800,000 | 3,800,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 1,520,910 | 1,520,910 |
Number of Senior Executives Received RSU | 12 |  |
The 2009 ESPP [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 1,500,000 | 1,500,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate | 10.00% | 10.00% |
Share Based Compensation Arrangement By Share Based Payment Award Maximum Amount Of Stock Per Employee | $ | $ 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, Discount from Market Price, Offering Date | 15.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 467,660 | 467,660 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  | 6,834

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