Note 11 - Revenues - Summary of Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation Of Revenue [Line Items]
Rental income	$ 9,255	$ 10,257	$ 18,766	$ 20,465
Sublease income	0	9	0	21
Total Out of Scope of Topic 606 revenue	9,255	10,266	18,766	20,486
Total revenues	10,131	10,973	20,202	22,105
Accounting Standards Update Topic 606
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	876	707	1,436	1,619
Leasing Commissions [Member] | Accounting Standards Update Topic 606 | Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	727	517	1,187	1,335
Property and Asset Management Fees [Member] | Accounting Standards Update Topic 606 | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	33	29	69	62
Sales Commissions [Member] | Accounting Standards Update Topic 606 | Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	97	146	139	184
Development Fees [Member] | Accounting Standards Update Topic 606 | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	0	0	1	9
Engineering Services [Member] | Accounting Standards Update Topic 606 | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	$ 19	$ 15	$ 40	$ 29