Note 2 - Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Total assets	$ 433	$ 2,815
Royalties payable due to related parties	10,376	9,213
Total liabilities	10,376	9,213
Fair Value, Inputs, Level 1 [Member]
Total assets	433	2,815
Royalties payable due to related parties	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 2 [Member]
Total assets	0	0
Royalties payable due to related parties	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 3 [Member]
Total assets	0	0
Royalties payable due to related parties	10,376	9,213
Total liabilities	10,376	9,213
Mutual Fund [Member]
Cash Equivalents	420	2,803
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Cash Equivalents	420	2,803
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Cash Equivalents	0	0
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Cash Equivalents	0	0
Money Market Funds [Member]
Cash Equivalents	13	12
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash Equivalents	13	12
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Cash Equivalents	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Cash Equivalents	$ 0	$ 0