Note 10 - Partners' Capital (Deficit) and Distributions - Distributions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Preferred Unit, Cash Distribution [Member]
Distributions	$ 25,138	$ 25,519
Preferred Unit, Cash Distribution [Member] | Preferred Partner [Member]
Distributions	24,740	25,115
Preferred Unit, Cash Distribution [Member] | General Partner [Member]
Distributions	398	404
Common Unit, Cash Distribution [Member]
Distributions	6,977	6,887
Common Unit, Cash Distribution [Member] | General Partner [Member]
Distributions	111	109
Common Unit, Cash Distribution [Member] | Limited Partner [Member]
Distributions	6,637	6,576
Common Unit, Cash Distribution [Member] | Phantom and Restricted Units Holders [Member]
Distributions	$ 229	$ 202