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	6 Months Ended	12 Months Ended
Jun. 30, 2025	Dec. 31, 2024
SPD Bank [Member]
Long-term debt, maximum	$ 24.3	$ 24.3
Long-term debt, maturity date	May 24, 2029	May 24, 2029
SPD Bank [Member] \| Renewed SPD Credit Line [Member]
Long-term debt, maximum	$ 22.7	$ 22.7
Long-term debt, interest	3.10%	3.10%
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	$ 28.5	$ 28.5
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	3.10%	3.10%
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.

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-Topic 210
-SubTopic 10
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-Section S99
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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

+ References

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-Topic 820
-SubTopic 10
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
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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
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
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