Note K - Notes Payable and Long-term Debt - Schedule of Notes Payable and Long-term Debt (Details) (Parentheticals) - Revolving Credit Facility [Member] - USD ($) $ in Billions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
SPD Bank [Member]
Long-term debt, maximum	$ 23.6	$ 23.6
Long-term debt, maturity date	May 24, 2029	May 24, 2029
SPD Bank [Member] \| Minimum [Member]
Long-term debt, interest	4.00%	4.00%
SPD Bank [Member] \| Maximum [Member]
Long-term debt, interest	4.35%	4.35%
China Zheshang Bank Co., Ltd [Member] \| The ¥200M Credit Facility [Member]
Long-term debt, maximum	$ 27.8	$ 27.8
Long-term debt, maturity date	Jun. 06, 2027	Jun. 06, 2027
China Zheshang Bank Co., Ltd [Member] \| Minimum [Member] \| The ¥200M Credit Facility [Member]
Long-term debt, interest	4.00%	4.00%
China Zheshang Bank Co., Ltd [Member] \| Maximum [Member] \| The ¥200M Credit Facility [Member]
Long-term debt, interest	4.35%	4.35%

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Section 50
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- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
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Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- Details

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