Note 2 - Summary of Significant Accounting Policies - Reconciliation of Level 3 Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024
Debt Securities [Member]
Balance, asset	$ 874	$ 0	$ 0	$ 0	$ 0	$ 0
Change in fair value, asset	107	10	0	0	0	0
Purchased, asset		864
Balance, asset	981	874	0	0	0	0
Royalties Payable [Member]
Balance, liability	12,043	10,376	9,213	8,564	7,060	6,974
Change in fair value, liability	(726)	1,667	1,163	1,233	1,504	86
Purchased, liability		0
Balance, liability	$ 11,317	$ 12,043	$ 10,376	$ 9,797	$ 8,564	$ 7,060