Note K - Notes Payable and Long-term Debt - Schedule of Notes Payable and Long-term Debt (Details) (Parentheticals) - Revolving Credit Facility [Member] - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Nov. 16, 2022
CIT Northbridge Credit, LLC [Member] \| Loan Security and Guarantee Agreement [Member]
Long-term debt, maximum	$ 27,800	$ 27,800	$ 27,780
Long-term debt, interest	8.984%	8.984%
CIT Northbridge Credit, LLC [Member] \| Loan Security and Guarantee Agreement [Member] \| Minimum [Member]
Long-term debt, maturity date	Dec. 14, 2023	Dec. 14, 2023
CIT Northbridge Credit, LLC [Member] \| Loan Security and Guarantee Agreement [Member] \| Maximum [Member]
Long-term debt, maturity date	Nov. 16, 2025	Nov. 16, 2025
SPD Bank [Member]
Long-term debt, maximum	$ 19,040	$ 19,040
Long-term debt, maturity date	May 24, 2024	May 24, 2024
SPD Bank [Member] \| Minimum [Member]
Long-term debt, interest	4.57%	4.57%
SPD Bank [Member] \| Maximum [Member]
Long-term debt, interest	6.12%	6.12%
China Zheshang Bank Co., Ltd [Member] \| The ¥200M Credit Facility [Member]
Long-term debt, maximum	$ 26,650	$ 26,650
Long-term debt, maturity date	Jun. 06, 2027	Jun. 06, 2027
China Zheshang Bank Co., Ltd [Member] \| The ¥200M Credit Facility [Member] \| Minimum [Member]
Long-term debt, interest	4.45%	4.45%
China Zheshang Bank Co., Ltd [Member] \| The ¥200M Credit Facility [Member] \| Maximum [Member]
Long-term debt, interest	6.60%	6.60%

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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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/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

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

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section S99
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- 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
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
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- Details

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