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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

X

- Definition

Represents the term of an investment in held-to-maturity debt securities.

+ References

No definition available.

+ Details

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X

- Definition

Represents the interest rate of an investment in held-to-maturity debt securities.

+ References

No definition available.

+ Details

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X

- Definition

Represents the limit of a bond held for investment.

+ References

No definition available.

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X

- 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

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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

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