Note 13 - Revenue Recognition - Analysis of Product Sales Allowances and Accruals (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended	18 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Jun. 30, 2023
Total gross Rayaldee sales	$ 265,418		$ 309,893	$ 502,995	$ 639,111
Rayaldee [Member]
Balance at beginning	8,390	$ 8,278	9,203	8,278	10,152	$ 10,152	$ 10,152
Provision related to current period sales	9,862		9,161	17,499	17,514
Credits or payments made	(8,334)		(8,588)	(15,859)	(17,890)
Balance at end	9,918	8,390	9,776	9,918	9,776	8,278	9,918
Total gross Rayaldee sales	$ 17,568		$ 15,382	$ 31,850	$ 28,861
Provision for Rayaldee sales allowances and accruals as a percentage of gross Rayaldee sales	56.00%		60.00%	55.00%	61.00%
Chargebacks, Discounts, Rebates and Fees [Member] | Rayaldee [Member]
Balance at beginning	$ 1,574	1,532	$ 1,588	$ 1,532	$ 2,014	2,014	2,014
Provision related to current period sales	3,950		3,411	7,256	6,626
Credits or payments made	(3,194)		(3,330)	(6,458)	(6,971)
Balance at end	2,330	1,574	1,669	2,330	1,669	1,532	2,330
Governmental [Member] | Rayaldee [Member]
Balance at beginning	5,140	5,063	5,282	5,063	5,499	5,499	5,499
Provision related to current period sales	5,561		5,442	9,606	10,311
Credits or payments made	(4,747)		(4,235)	(8,715)	(9,321)
Balance at end	5,954	5,140	6,489	5,954	6,489	5,063	5,954
Sales Returns [Member] | Rayaldee [Member]
Balance at beginning	1,676	1,683	2,333	1,683	2,639	2,639	2,639
Provision related to current period sales	351		308	637	577
Credits or payments made	(393)		(1,023)	(686)	(1,598)
Balance at end	$ 1,634	$ 1,676	$ 1,618	$ 1,634	$ 1,618	$ 1,683	$ 1,634