Note 6 - Long-term Prepaid Contracts (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Jul. 31, 2024	Dec. 31, 2023
Prepaid Expense, Noncurrent	$ 904	$ 1,200	$ 1,214
Proceeds from Clinical Trial Activities	$ 300

Sum of the carrying amounts as of the balance sheet date of amounts paid in advance for expenses which will be charged against earnings in periods after one year or beyond the operating cycle, if longer.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Name:	us-gaap_PrepaidExpenseNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant