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Note 11 - Notes Payable and Long-term Debt - Schedule of Notes Payable and Long-term Debt (Details) (Parentheticals) - Revolving Credit Facility [Member] - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
SPD Bank [Member]
Long-term debt, maximum		$ 24.3
SPD Bank [Member] | Renewed SPD Credit Line [Member]
Long-term debt, maximum	$ 35.2
Long-term debt, interest	2.60%
Long-term debt, maturity date	Jul. 29, 2030
SPD Bank [Member] | Minimum [Member]
Long-term debt, interest		4.00%
SPD Bank [Member] | Maximum [Member]
Long-term debt, interest		4.35%
China Zheshang Bank Co., Ltd [Member] | The ¥200M Credit Facility [Member]
Long-term debt, maximum		$ 28.5
China Zheshang Bank Co., Ltd [Member] | Renewed CZB Credit Line [Member]
Long-term debt, maximum	$ 22.9
Long-term debt, interest	2.95%
Long-term debt, maturity date	Jun. 26, 2030
China Zheshang Bank Co., Ltd [Member] | Minimum [Member] | The ¥200M Credit Facility [Member]
Long-term debt, interest		3.10%
China Zheshang Bank Co., Ltd [Member] | Maximum [Member] | The ¥200M Credit Facility [Member]
Long-term debt, interest		4.35%

X

- Definition

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

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

Reference 2: 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

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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
-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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-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- 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

Reference 2: 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(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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