Note 10 - Marketable Securities - Summary of Investments (Details) - USD ($) |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Equity Securities, FV-NI, Cost | $ 750,441 | $ 713,120 |
| Equity Securities, FV-NI, Current | 853,443 | 777,963 |
| Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss) | 103,002 | 64,843 |
| Marketable securities, cost | 7,100,054 | 7,257,803 |
| Marketable securities, fair value | 7,203,056 | 7,322,646 |
| Marketable securities, unrealized gain | 103,002 | 64,843 |
| US Treasury Bill Securities [Member] | ||
| Other Short-term Investments, cost | 6,349,613 | 6,544,683 |
| Other Short-term Investments, fair value | $ 6,349,613 | $ 6,544,683 |
| X | ||||||||||
- Definition Cost of investment in debt securities classified as held to maturity and equity securities. No definition available.
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- Definition Fair value of investment in debt securities classified as held to maturity and equity securities. No definition available.
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| X | ||||||||||
- Definition Amount of accumulated unrealized gain (loss) in debt securities classified as held to maturity and equity securities. No definition available.
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| X | ||||||||||
- Definition Accumulated amount of unrealized gain (loss) on equity securities. No definition available.
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- Definition Represents the amount of other short-term investments at cost. No definition available.
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- Definition Represents the fair value of other short-term investments. No definition available.
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Details
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