Note 7 - Discontinued Operations - Sale of OMIDRIA - Net Income From Discontinued Operations (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income tax expense (1)		$ 462	$ 3,952	$ 1,006
Discontinued Operations, Disposed of by Sale [Member] | Omidria Assets Disposal [Member]
Costs and expenses		0	0	30,631
Gross margin		0	0	80,104
Gain on sale of OMIDRIA		0	0	305,648
Interest on OMIDRIA contract royalty asset		15,315	18,634	0
Remeasurement adjustments		41,167	14,457	0
Other income		1,087	307	1,035
Income before income tax		57,569	233,398	386,787
Income tax expense (1)		(462)	(3,952)	(1,006)
Net income from discontinued operations, net of tax		57,107	229,446	385,781
Discontinued Operations, Disposed of by Sale [Member] | Omidria Assets Disposal [Member] | Product [Member]
Revenue	[1]	0	0	110,735
Discontinued Operations, Disposed of by Sale [Member] | Omidria Assets Disposal [Member] | Development Milestones [Member]
Revenue		$ 0	$ 200,000	$ 0

[1] For further discussion of income tax expense refer to “Note 13 – Income Taxes”.