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Note 8 - Stockholders' Equity and Stock Incentive Plans (Details Textual) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Performance Shares [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) | 364,810 | 395,964
Shares Issued Per Unit (in shares) | 1.53 | 1.67
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) | 126,465 | 125,004
Share Based Payment Arrangement, Shares Issued In Period, Net of Tax Withholdings (in shares) | 238,345 | 270,960
The 2018 Plan [Member] |  |
Stock Repurchase Program, Authorized Amount | $ 100.0 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 61.4 |

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- Definition Shares issued during the period net of tax withholding for share based payment arrangements + References No definition available. + Details
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- Definition Number of Shares issued Per Unit. + References No definition available. + Details
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- Definition Number of shares issued under share-based payment arrangement. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Details
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- Details
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