Note 2 - Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Total assets	$ 2,815	$ 3,407
Royalties payable due to related parties	9,213	6,974
Total liabilities	9,213	6,974
Fair Value, Inputs, Level 1 [Member]
Total assets	2,815	3,407
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	9,213	6,974
Total liabilities	9,213	6,974
Mutual Fund [Member]
Cash Equivalents	2,803	3,397
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Cash Equivalents	2,803	3,397
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	12	10
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash Equivalents	12	10
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