Note 6 - Other Revenues - Summary of Other Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Rental income	$ 5,792	$ 5,646	$ 16,954	$ 16,972
Management and accounting services fees	4,244	4,052	12,703	12,651
Insurance services	1,291	1,294	3,832	4,074
Other	164	119	427	766
Total other revenues	$ 11,491	$ 11,111	$ 33,916	$ 34,463