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Note 7 - Stockholders' Equity and Stock Incentive Plans (Details Textual) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2020 | Dec. 12, 2018
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 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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