Note 13 - Related Party Transactions (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	May 04, 2016	Jul. 08, 2015
Promissory Notes, Natural Habitat Acquisition [Member]
Debt Instrument, Face Amount	$ 2,500
National Geographic Society [Member] \| Collaborate Agreement [Member]
Call Options, Exercise Price		$ 10
Call Options, Percentage of Issued and Outstanding Shares		5.00%

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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