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Note 11 - Condensed Consolidating Financial Information (Details Textual)	Mar. 31, 2020	Dec. 31, 2019
Subsidiary [Member]
Noncontrolling Interest, Ownership Percentage by Parent	100.00%	100.00%
Senior Notes [Member] | Senior Notes 6.375% Due 2026 [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.375%	6.375%
Senior Notes [Member] | Senior Notes 6.000% Due 2026 [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%
Senior Notes [Member] | The 4.750% Senior NotesDue December 2027 [Member]
Debt Instrument, Interest Rate, Stated Percentage	4.75%	4.75%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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- Details

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- Details

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