Note 13 - Earnings Per Share (Details Textual) - 6.25% Convertible Notes Due 2018 [Member] - shares	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2018	May 01, 2018
Debt Instrument, Interest Rate, Stated Percentage			6.25%
Convertible Notes Payable [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	322	648
Debt Instrument, Interest Rate, Stated Percentage	6.25%	6.25%

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration