Note 9 - Revenues - Summary of Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Rental income	$ 7,369	$ 5,875	$ 21,034	$ 14,629
Sublease income	17		68
Total Out of Scope of Topic 606 revenue	7,386	5,875	21,102	14,629
Total revenues	7,931	7,007	23,626	17,623
Accounting Standards Update 2014-09 [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	545	1,132	2,524	2,994
Leasing Commissions [Member] | Accounting Standards Update 2014-09 [Member] | Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	201	668	1,558	1,734
Property and Asset Management Fees [Member] | Accounting Standards Update 2014-09 [Member] | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	85	144	232	490
Sales Commissions [Member] | Accounting Standards Update 2014-09 [Member] | Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	212	186	584	326
Development Fees [Member] | Accounting Standards Update 2014-09 [Member] | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	0	70	0	247
Engineering Services [Member] | Accounting Standards Update 2014-09 [Member] | Over Time [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	$ 47	$ 64	$ 150	$ 197