| Note 7 - Investment in Macrophage Therapeutics, Inc. (Details Textual) - New York Litigation Involving Former CEO and President [Member] - Judicial Ruling [Member] | Apr. 21, 2021  USD ($) | 
|---|---|
| Litigation Settlement, Amount Can Be Awarded to Other Party for Indemnification for Attorneys’ Fees | $ 14,955 | 
| Litigation Settlement, Amount Can Be Advanced to Other Party for Attorneys’ Fees Subject to Repayment | $ 1,237.50 | 
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- Definition Represents amount that can be advanced to other party for attorneys’ fees subject to repayment. No definition available. 
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| X | ||||||||||
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- Definition Represents the amount that can be awarded to other party for indemnification related to attorneys’ fees. No definition available. 
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| X | ||||||||||
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- Details 
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| X | ||||||||||
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- Details 
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