Note 4 - Other Revenues - Summary of Other Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Rental income	$ 5,678	$ 5,548	$ 16,963	$ 16,633
Management and accounting services fees	4,520	3,818	13,567	11,265
Insurance services	1,528	1,716	4,667	5,362
Other	251	417	841	996
Total other revenues	$ 11,977	$ 11,499	$ 36,038	$ 34,256