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Note 18 - Equity Incentive Plans (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Proceeds from Stock Options Exercised | $ 0 | $ 0 | $ 838
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  |  | 35,880
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  | 0 |
Share-based Payment Arrangement, Expense | 5,600 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 8,400 | 9,300 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 10 months 24 days |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 3 years |  |
Share-based Payment Arrangement, Expense |  | $ 6,600 | $ 7,300
Performance-based Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 3 years |  |
Performance-based Restricted Stock Units [Member] | Minimum [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target | 0.00% |  |
Performance-based Restricted Stock Units [Member] | Maximum [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target | 150.00% |  |
2005 Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 2,045,451 |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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