Note 11 - Revenues - Summary of Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Rental income	$ 9,206	$ 7,369	$ 29,671	$ 21,034
Sublease income	12	17	33	68
Total Out of Scope of Topic 606 revenue	9,218	7,386	29,704	21,102
Total revenues	10,047	7,931	32,152	23,626
Accounting Standards Update 2014-09 [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	829	545	2,448	2,524
Leasing Commissions [Member] | Accounting Standards Update 2014-09 [Member] | Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	675	201	2,010	1,558
Property and Asset Management Fees [Member] | Accounting Standards Update 2014-09 [Member] | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	27	85	89	232
Sales Commissions [Member] | Accounting Standards Update 2014-09 [Member] | Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	76	212	260	584
Development Fees [Member] | Accounting Standards Update 2014-09 [Member] | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	33	0	42	0
Engineering Services [Member] | Accounting Standards Update 2014-09 [Member] | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	$ 18	$ 47	$ 47	$ 150