Note 13 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Embedded Derivative, Fair Value of Embedded Derivative Liability	$ 29
Series F Warrants and Series K Warrants [Member]
Warrants and Rights Outstanding	$ 0	$ 10

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959

Name:	us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant