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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Unrealized Gain (Loss), Foreign Currency Transaction, before Tax | $ (292,000) | $ (272,000)
Selling, General and Administrative Expenses [Member] |  |
Depreciation, Depletion and Amortization, Nonproduction | 164,000 | $ 204,000
HONG KONG |  |
Cash, Uninsured Amount | 890,000 |
CHINA |  |
Restricted Cash | $ 3,700,000 |
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 (Year) | 2 years |
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 (Year) | 5 years |
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 |

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