Note 4 - Other Revenues - Summary of Other Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Insurance services	$ 1,615	$ 1,955	$ 3,139	$ 3,646
Management and accounting services fees	4,297	3,738	9,047	7,446
Rental income	5,677	5,553	11,285	11,086
Other	298	242	590	579
Total other revenues	$ 11,887	$ 11,488	$ 24,061	$ 22,757