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Note 8 - Stockholders' Equity and Stock Incentive Plans (Details Textual) - USD ($) $ in Millions	3 Months Ended
	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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Shares issued during the period net of tax withholding for share based payment arrangements

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- Definition

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+ 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

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