Note 18 - Weighted Average Shares Outstanding and Net (Loss) Income Per Share (Details Textual) - $ / shares		12 Months Ended
Oct. 29, 2019	Dec. 31, 2020	Dec. 31, 2019	Nov. 30, 2019
Share Price, Potential Dilutive Effect (in dollars per share)		$ 31.47
The 2.75% Convertible Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage		2.75%		2.75%
Share Price, Potential Dilutive Effect (in dollars per share)	$ 31.47	$ 31.47
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)		589,000	388,000

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://www.xbrl.org/2003/role/disclosureRef
-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