Note 3 - Marketable Securities (Details Textual) $ in Thousands, R$ in Millions	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 BRL (R$)
Marketable Securities, Current, Total	$ 0	$ 3,905
Certificates of Deposit [Member]
Marketable Securities, Current, Total		$ 4,000	R$ 15

Amount of investment in marketable security, classified as current.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_MarketableSecuritiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant