Note 2 - Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Trading debt securities	$ 981	$ 0
Total assets	2,004	2,815
Current portion of royalties payable due to related parties	574	145
Royalties payable due to related parties	10,743	9,068
Total liabilities	11,317	9,213
Fair Value, Inputs, Level 1 [Member]
Trading debt securities	0
Total assets	1,023	2,815
Current portion of royalties payable due to related parties	0	0
Royalties payable due to related parties	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 2 [Member]
Trading debt securities	0
Total assets	0	0
Current portion of royalties payable due to related parties	0	0
Royalties payable due to related parties	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 3 [Member]
Trading debt securities	981
Total assets	981	0
Current portion of royalties payable due to related parties	574	145
Royalties payable due to related parties	10,743	9,068
Total liabilities	11,317	9,213
Mutual Fund [Member]
Cash Equivalents	900	2,803
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Cash Equivalents	900	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	123	12
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash Equivalents	123	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