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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual) ₫ in Billions | 12 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) | Nov. 30, 2019 VND (₫)
Foreign Currency Transaction Gain (Loss), Unrealized | $ (272,000) | $ (248,000) |  |
Cash and Cash Equivalents, at Carrying Value, Total | 69,667,000 | 83,843,000 | $ 69,667,000 |
Selling, General and Administrative Expenses [Member] |  |  |  |
Depreciation, Depletion and Amortization, Nonproduction, Total | $ 204,000 |  | $ 299,000 |
VIET NAM |  |  |  |
Restricted Cash and Cash Equivalents, Total |  | $ 438,000 |  | ₫ 10
KOREA, DEMOCRATIC PEOPLE'S REPUBLIC OF |  |  |  |
Restricted Cash, Collateral Requirement Percentage | 100.00% |  | 100.00% |
HONG KONG | Revenue from Contract with Customer Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |  |
Concentration Risk, Percentage | 78.00% |  |  |
CHINA |  |  |  |
Cash and Cash Equivalents, at Carrying Value, Total | $ 4,200,000 |  | $ 4,200,000 |
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 |  |  |

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