Note 9 - Net Income Per Limited Partner Unit - Earning Per Unit (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Net income (loss)	$ 110,530	$ (13,480)
General partner interest in net income (loss)	1,751	(213)
Preferred interest in net income	24,824	25,115
Net income (loss) available to limited partners	$ 83,955	$ (38,382)
Common units (in shares)	41,484	41,104
Restricted and phantom units (in shares)	1,453	1,285
Total units (in shares)	42,937	42,389
Basic and diluted net income (loss) from discontinued operations per common unit (in dollars per share)	$ 1.74	$ (0.98)
Basic and diluted net income from continuing operations per common unit (in dollars per share)	0.22	0.07
Basic and diluted net income (loss) per common unit (in dollars per share)	$ 1.96	$ (0.91)