Note 3 - Operating Property Activities - Acquisition of Operating Properties (Details) ft² in Thousands, $ in Thousands	6 Months Ended
Jun. 30, 2019 USD ($) ft²
Purchase Price Cash \| $	$ 31,269
Purchase Price GLA (Square Foot) \| ft²	125
Bell Camino Out-parcel [Member]
Purchase Price Cash \| $	$ 5,678
Purchase Price GLA (Square Foot) \| ft²	45
Gateway at Donner Pass Out-parcel [Member]
Purchase Price Cash \| $	$ 13,527
Purchase Price GLA (Square Foot) \| ft²	40
Rancho Penasquitos Out-parcel [Member]
Purchase Price Cash \| $	$ 12,064
Purchase Price GLA (Square Foot) \| ft²	40

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration