Note 15 - Stock Options and Stock-based Employee Compensation - Stock Options and Restricted Stock Units (RSUs) Outstanding and Available for Future Issuance (Details) - shares shares in Thousands	Dec. 31, 2019	Dec. 31, 2018
2011 Plan (in shares)	5,422	4,568
The 2011 Long-term Incentive Plan [Member]
2011 Plan (in shares)	5,412	4,558
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	448	1,453
Non-Plan [Member]
2011 Plan (in shares)	10	10

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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=116856206&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant