Note 2 - Summary of Significant Accounting Policies - Deferred Lease Liability and Incentive (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred lease incentive	$ 26	$ 26
Deferred lease liability	1,541	1,225
Deferred lease incentive	$ 277	$ 303

This element represents revenue received, but not recognized for financial reporting purposes, which is anticipated to be recognized for financial reporting purposes more than one year from the reporting date or one operating cycle, if longer. Such deferred revenue may consist of and include amounts paid in advance by lessees and purchase price adjustments for leases acquired in a business combination or other transaction and is net of the accumulated amortization of such amounts that to date have been recognized in revenue.

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