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Note 13 - Fair Value Measurements - Schedule of Fair Value Assets Measured on Recurring Basis (Details) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Number of shares owned (in shares) | 2,421,180 | 2,421,180
Quoted market price (in dollars per share) | $ 0.06665 | $ 0.04429
Fair value of marketable equity securities | $ 161,381 | $ 107,234

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