Note 13 - Equity - Cash Distributions Paid or Payable (Details) - Cash Distribution [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Amount Paid	$ 6,013	$ 6,011	$ 5,996	$ 5,996	$ 5,992	$ 5,989	$ 5,972	$ 5,351	$ 24,016	$ 23,304
Common Stock [Member]
Distributions Per Common Share (in dollars per share)	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.1075	$ 0.48	$ 0.4675
Amount Paid	$ 5,930	$ 5,928	$ 5,913	$ 5,913	$ 5,909	$ 5,901	$ 5,880	$ 5,268	$ 23,684	$ 22,958
OP Units [Member]
Distributions Per Common Share (in dollars per share)	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.1075	$ 0.48	$ 0.4675
Amount Paid	$ 83	$ 83	$ 83	$ 83	$ 83	$ 88	$ 92	$ 83	$ 332	$ 346