Note 6 - Net Income (Loss) Per Common Unit (Details Textual) - $ / shares shares in Thousands	Dec. 31, 2022	Dec. 31, 2021	Nov. 10, 2021	Dec. 31, 2020	Mar. 02, 2017
Warrants at 22.81 Strike Price [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 22.81		$ 22.81
Warrants at 34.00 Strike Price [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 34.00
Warrant Holder [Member] | Warrants at 22.81 Strike Price [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	750	750		1,750
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 22.81	$ 22.81		$ 22.81
Warrant Holder [Member] | Warrants at 34.00 Strike Price [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	2,250	2,250		2,250
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 34.00	$ 34.00		$ 34.00