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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 | 3 Months Ended
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Mar. 31, 2025 | Mar. 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] | 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%

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