Note 12 - Financial Income, Net (Details Textual) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)
Accounting Standards Update 2016-02 [Member]
Effect of Exchange Rate on Cash, Total	$ 785

Amount of effect of exchange rate changes on cash balances held in foreign currencies. Excludes cash equivalents.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 230
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906

Name:	us-gaap_EffectOfExchangeRateOnCash
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration