Note 10 - Partners' Capital (Deficit) and Distributions - Distributions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Preferred Unit, Cash Distribution [Member]
Distributions	$ 25,521	$ 25,523
Preferred Unit, Cash Distribution [Member] | Preferred Partner [Member]
Distributions	25,115	25,115
Preferred Unit, Cash Distribution [Member] | General Partner [Member]
Distributions	406	408
Common Unit, Cash Distribution [Member]
Distributions	8,468	19,213
Common Unit, Cash Distribution [Member] | General Partner [Member]
Distributions	135	626
Common Unit, Cash Distribution [Member] | Limited Partner [Member]
Distributions	8,150	18,154
Common Unit, Cash Distribution [Member] | Phantom and Restricted Units Holders [Member]
Distributions	$ 183	$ 433