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Note I - Investment in Debt Security (Details Textual) - Debt Security, Corporate, Non-US [Member] | Sep. 30, 2020 USD ($) | Sep. 30, 2020 HKD ($) | Jun. 30, 2020
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Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Current | $ 512,821 | $ 4,000,000 |
Investment in Held-to-maturity Debt Securities, Interest Rate |  |  | 500.00%

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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, 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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-2 + Details
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- Details
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