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)	1,807	1,522
The 2011 Long-term Incentive Plan [Member]
2011 Plan (in shares)	1,804	1,519
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	149	484
Non-Plan [Member]
2011 Plan (in shares)	3	3

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=120381028&loc=d3e5070-113901

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant