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Note J - Investment in Debt Security (Details Textual)	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 HKD ($)	Dec. 31, 2019 HKD ($)
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Current	$ 0	$ 512,821
Investment Income, Interest	$ 4,075	$ 30,649
Debt Security, Corporate, Non-US [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, 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
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Noncurrent				$ 60,000

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.

+ Details

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X

- Definition

Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity), classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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

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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

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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=123367319&loc=SL114868664-224227

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
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-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599

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