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Note 2 - Summary of Significant Accounting Policies - Revenues and Accounts Receivable from Major Distribution Partners and Customers (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Major U.S. Retailer A [Member]    
Accounts receivable, net $ 194  
Distributor A [Member]    
Accounts receivable, net 46  
Distributor B [Member]    
Accounts receivable, net 39 $ 93
Distributor C [Member]    
Accounts receivable, net $ 39  
Chongqing Pioneer Pharma Holdings Limited [Member]    
Accounts receivable, net   $ 243