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Note 12 - Investment in Debt Security (Details Textual) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 HKD ($)
--- | --- | --- | --- | ---
Debt Securities, Held-to-maturity, Current | $ 512,821 | $ 512,821 |  |
Debt Security, Corporate, Non-US [Member] |  |  |  |
Debt Securities, Held-to-maturity, Current |  |  | $ 512,821 | $ 4,000,000
Limit of Bond |  |  |  | $ 20,000,000
Investment in Held-to-maturity Debt Securities, Interest Rate |  |  | 5.00% | 5.00%

X
- Definition Represents the interest rate of an investment in held-to-maturity debt securities. + References No definition available. + Details
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- Definition Represents the limit of a bond held for investment. + References No definition available. + Details
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- Definition Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity), classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26626-111562 + Details
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- Details
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