Note 7 - Discontinued Operations - Sale of OMIDRIA - Contract Royalty Asset (Details) - Discontinued Operations, Disposed of by Sale [Member] - Omidria Assets Disposal [Member] - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
OMIDRIA contract royalty asset at December 31, 2021	$ 152,222	$ 184,570
Royalties earned	40,595	(65,439)
Interest on OMIDRIA contract royalty asset	15,315	18,634	$ 0
Remeasurement adjustments	41,167	14,457	0
Royalties earned	(40,595)	65,439
OMIDRIA contract royalty asset at December 31, 2022	$ 168,109	$ 152,222	$ 184,570

Note 7 - Discontinued Operations - Sale of OMIDRIA - Contract Royalty Asset (Details) - Discontinued Operations, Disposed of by Sale [Member] - Omidria Assets Disposal [Member] - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

OMIDRIA contract royalty asset at December 31, 2021

$ 152,222

$ 184,570

Royalties earned

40,595

(65,439)

Interest on OMIDRIA contract royalty asset

15,315