Note 2 - Summary of Significant Accounting Policies - Deferred Lease Liability and Incentive (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Deferred lease incentive	$ 26
Deferred lease liability	1,541
Deferred lease incentive	$ 277

Amount, after accumulated amortization, of deferred lease income, classified as noncurrent. Includes, but is not limited to, amount paid in advance by lessee.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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