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Note 8 - Long-term Investments (Details Textual) |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 05, 2024 USD ($) $ / shares shares | Sep. 27, 2022 USD ($) shares | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jan. 26, 2025 USD ($) shares | Dec. 31, 2024 USD ($)
Stock Issued During Period, Value, New Issues |  |  | $ 300,000 |  |  |
Payments to Acquire Investments |  |  | 1,300,000 | $ (0) |  |
Stock Purchase Agreement [Member] | QBSG Limited [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares |  | 86,339 |  |  |  |
Stock Issued During Period, Value, New Issues |  | $ 1,350,000 |  |  |  |
Profit Participation Agreement [Member] | QBSG Limited [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares | 113,636 |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ 500,000 |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares | $ 4.4 |  |  |  |  |
QBSG Limited [Member] |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) | shares |  | 65,700 |  |  |  |
Investment Owned, Percentage of Total Issued Share Capital | 15.00% | 9.00% |  |  |  |
Investment Ownership, Additional Percentage Acquired in Transaction | 6.00% |  |  |  |  |
Investment Ownership, Additional Percentage Acquired, Consideration Transferred | $ 1,200,000 |  |  |  |  |
Payments to Acquire Investments | $ 700,000 |  |  |  |  |
QBSG Limited [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Investment Owned, Percentage of Total Issued Share Capital |  |  |  |  |  | 6.00%
Investment Owned, Cost |  |  |  |  |  | $ 1,200,000
Investment Owned, Fair Value |  |  | $ 1,156,000 |  |  |
QBSG Limited [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Weighted Average Cost of Capital [Member] |  |  |  |  |  |
Equity Securities, FV-NI, Measurement Input |  |  | 0.15 |  |  |
QBSG Limited [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Long-Term Revenue Growth Rate [Member] |  |  |  |  |  |
Equity Securities, FV-NI, Measurement Input |  |  | 0.10 |  |  |
QBSG Limited [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Pre-tax Operating Margin [Member] |  |  |  |  |  |
Equity Securities, FV-NI, Measurement Input |  |  | 0.15 |  |  |
QBSG Limited [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount for Lack of Control [Member] |  |  |  |  |  |
Equity Securities, FV-NI, Measurement Input |  |  | 0.20 |  |  |
QBSG Limited [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount for Lack of Marketability [Member] |  |  |  |  |  |
Equity Securities, FV-NI, Measurement Input |  |  | 0.40 |  |  |
AI Geometric Ltd [Member] |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) | shares |  |  |  |  | 1,300 |
Investment Owned, Percentage of Total Issued Share Capital |  |  |  |  | 13.00% |
Investment Owned, Balance, Principal Amount |  |  |  |  | $ 1,300,000 |

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