Note 3 - Operating Property Activities - Acquisition of Operating Properties (Details) ft² in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) ft²
Purchase Price Cash | $	$ 31,269	[1]
Purchase Price GLA (Square Foot) | ft²	125	[2]
Bell Camino Out-parcel [Member]
Purchase Price Cash | $	$ 5,678	[1]
Purchase Price GLA (Square Foot) | ft²	45	[2]
Gateway at Donner Pass Out-parcel [Member]
Purchase Price Cash | $	$ 13,527	[1]
Purchase Price GLA (Square Foot) | ft²	40	[2]
Rancho Penasquitos Out-parcel [Member]
Purchase Price Cash | $	$ 12,064	[1]
Purchase Price GLA (Square Foot) | ft²	40	[2]

[1] The Company utilized an aggregate $31.0 million associated with Internal Revenue Code 1031 sales proceeds.

[2] Gross leasable area ("GLA")