Note 15 - Revenue Recognition - Analysis of Product Sales Allowances and Accruals (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended			24 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023
Total gross Rayaldee sales	$ 181,905	$ 178,595	$ 265,418	$ 237,577	$ 185,340	$ 179,744	$ 309,893	$ 329,219	$ 863,495	$ 1,004,196	$ 1,774,718
Rayaldee [Member]
Balance at beginning				8,278				10,152	8,278	10,152	11,737	$ 10,152
Provision related to current period sales									36,546	32,330	37,265
Credits or payments made									(33,904)	(34,204)	(38,850)
Balance at end	10,920				8,278				10,920	8,278	10,152	10,920
Total gross Rayaldee sales									$ 67,547	$ 59,557	$ 64,301
Provision for Rayaldee sales allowances and accruals as a percentage of gross Rayaldee sales									54.00%	54.00%	58.00%
Chargebacks, Discounts, Rebates and Fees [Member] | Rayaldee [Member]
Balance at beginning				1,532				2,014	$ 1,532	$ 2,014	$ 2,332	2,014
Provision related to current period sales									14,606	12,995	14,426
Credits or payments made									(13,560)	(13,477)	(14,744)
Balance at end	2,578				1,532				2,578	1,532	2,014	2,578
Governmental [Member] | Rayaldee [Member]
Balance at beginning				5,063				5,499	5,063	5,499	5,812	5,499
Provision related to current period sales									20,589	18,165	21,553
Credits or payments made									(19,502)	(18,601)	(21,866)
Balance at end	6,150				5,063				6,150	5,063	5,499	6,150
Sales Returns [Member] | Rayaldee [Member]
Balance at beginning				$ 1,683				$ 2,639	1,683	2,639	3,593	2,639
Provision related to current period sales									1,351	1,170	1,286
Credits or payments made									(842)	(2,126)	(2,240)
Balance at end	$ 2,192				$ 1,683				$ 2,192	$ 1,683	$ 2,639	$ 2,192