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Note 4 - Convertible Notes Payable (Details Textual) - USD ($) |  | 3 Months Ended
--- | --- | ---
Mar. 08, 2024 | Mar. 31, 2024 | Mar. 31, 2023
Related Party [Member] |  |  |
Interest Expense, Nonoperating |  | $ 10,819 | $ (0)
Senior Secured 2024 Notes [Member] |  |  |
Debt Instrument, Face Amount | $ 6,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.00% |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ 1.79 |  |
Debt Issuance Costs, Gross | $ 176,000 |  |
Debt Instrument, Term (Year) | 3 years |  |
Interest Payment |  | 0 |
Interest Expense, Nonoperating |  | 4,000 |
Debt Issuance Costs, Net |  | 4,000 |
Senior Secured 2024 Notes [Member] | Maximum [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.00% |  |
Senior Secured 2024 Notes [Member] | Related Party [Member] |  |  |
Debt Instrument, Face Amount | $ 2,000,000 | 2,000,000 |
Interest Payable |  | 10,000 |
Senior Secured 2024 Notes [Member] | Third Party [Member] |  |  |
Debt Instrument, Face Amount |  | 4,000,000 |
Interest Payable |  | 20,000 |
The Francisco Trust [Member] |  |  |
Debt Instrument, Face Amount |  | $ 1,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.00% |
The Francisco Trust [Member] | Mr. Thomas Emalfarb [Member] |  |  |
Interest Payable |  | $ 5,000 |
Irrevocable Trust [Member] | Bradley Emalfarb [Member] |  |  |
Debt Instrument, Face Amount |  | $ 500,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.00% |
Interest Payable |  | $ 2,000 |
Irrevocable Trust [Member] | Bradley Scott Emalfarb [Member] |  |  |
Debt Instrument, Face Amount |  | $ 410,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.00% |
Interest Payable |  | $ 2,000 |
Irrevocable Trust [Member] | Thomas Emalfarb, Scott Emalfarb and Michael Emalfarb [Member] |  |  |
Interest Payable |  | $ 400 |

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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-5 + Details
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