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Note J - Investments in Debt Security (Details Textual) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 HKD ($) | Dec. 31, 2019 HKD ($)
Debt Securities, Held-to-maturity, Current | $ 512,821 | $ 512,821 |  |  |
Investment Income, Interest | $ 30,649 | 154 |  |  |
Debt Security, Corporate, Non-US [Member] |  |  |  |  |
Debt Securities, Held-to-maturity, Current |  | $ 512,821 | $ 512,821 | $ 4,000,000 | $ 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 |  |  |
Limit of Bond |  |  |  | $ 20,000,000 |

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- Definition Represents the term of an investment in held-to-maturity debt securities. + References No definition available. + Details
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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 Represents the limit of a bond held for investment. + 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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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 + Details
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