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Note 6 - Stock-based Compensation (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  | 0
Benefit (Shortfall) of Tax Deductions from Share-based Compensation |  |  | $ 0.4 | $ 0.6 |
2005 Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 2,354,199 |  | 2,354,199 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 1.0 | $ 1.5 | $ 2.5 | 3.1 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 6.1 | $ 6.8 | $ 6.1 | $ 6.8 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 1 year 6 months |  |
Maximum [Member] |  |  |  |  |
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target |  |  |  |  | 150.00%

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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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