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Note 11 - Short-term Investment (Details Textual) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2020 HKD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 HKD ($)
Debt Securities, Held-to-maturity, Current | $ 516,121 | $ 516,121 |  | $ 512,821 | $ 516,121 |  | $ 4,000,000 | $ 512,821 | $ 4,000,000
Investment in Held-to-maturity Debt Securities, Term (Year) |  |  |  | 1 year |  |  |  |  |
Investment in Held-to-maturity Debt Securities, Interest Rate | 5.00% |  |  | 5.00% |  |  | 5.00% |  | 5.00%
Investment Income, Interest | $ 25,800 | $ 1,106 | $ 19 |  | $ 26,908 | $ 143 |  |  |
Limit of Bond |  |  |  |  |  |  | $ 20,000,000 |  |

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- Definition Represents the interest rate of an investment in held-to-maturity debt securities. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity), classified as current. + References Reference 1: 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=121553693&loc=d3e26626-111562 + Details
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