Annual report [Section 13 and 15(d), not S-K Item 405]

Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual)

v3.25.4
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Unrealized Gain (Loss), Foreign Currency Transaction, before Tax $ (90,000) $ (230,000)
Selling, General and Administrative Expenses [Member]    
Depreciation, Depletion and Amortization, Nonproduction 109,000 $ 131,000
HONG KONG    
Cash, Uninsured Amount 603,000,000,000  
CHINA    
Restricted Cash $ 2,900,000  
KOREA, DEMOCRATIC PEOPLE'S REPUBLIC OF    
Restricted Cash, Collateral Requirement Percentage 100.00%  
Minimum [Member]    
Cash and Cash Equivalents, Period to Receive Cash Proceeds From Credit Card Processors (Day) 2 days  
Minimum [Member] | Office Equipment, Office Software and Capitalized Internal-use Software Development [Member]    
Property, Plant and Equipment, Useful Life (Year) 3 years  
Minimum [Member] | Furniture and Fixtures [Member]    
Property, Plant and Equipment, Useful Life (Year) 5 years  
Maximum [Member]    
Cash and Cash Equivalents, Period to Receive Cash Proceeds From Credit Card Processors (Day) 5 days  
Maximum [Member] | Office Equipment, Office Software and Capitalized Internal-use Software Development [Member]    
Property, Plant and Equipment, Useful Life (Year) 5 years  
Maximum [Member] | Furniture and Fixtures [Member]    
Property, Plant and Equipment, Useful Life (Year) 7 years