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Note 9 - Related-party Transactions (Details Textual) - USD ($) $ in Thousands |  |  | 6 Months Ended
--- | --- | --- | ---
Feb. 18, 2019 | Aug. 11, 2017 | Jun. 30, 2024 | Jun. 30, 2023
Related Party, Eyemax LLC [Member] | The Eyemax Agreement [Member] |  |  |  |
Related Party Transaction, Terms (Year) |  | 10 years |  |
Related Party Transaction, Terms, Renewal (Year) |  | 2 years |  |
Related Party, Eyemax LLC [Member] | The Eyemax Agreement [Member] | Royalty [Member] |  |  |  |
Related Party Transaction, Rate |  | 10.00% |  |
Related Party, Eyemax LLC [Member] | The Eyemax Agreement [Member] | Research and Development Expense [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | $ 250 |  |
Related Party, Eyemax LLC [Member] | Covenant Based on Sale of First Commercial Product [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | $ 500 |  |
Related Party, Eyemax LLC [Member] | The Amended Agreement [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  | $ 0 |
Revenues |  |  | $ 1,840 |
Related Party, Eyemax LLC [Member] | The Amended Agreement [Member] | Covenant Based on Approval by The FDA [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction | $ 250 |  |  |
Related Party, Eyemax LLC [Member] | The Amended Agreement [Member] | Covenant Based on Sale of First Commercial Product [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction | $ 500 |  |  |
Related Party, Bausch Health [Member] | Royalty [Member] |  |  |  |
Related Party Transaction, Rate | 12.00% |  |  |
Related Party, Bausch Health [Member] | The Amended Agreement [Member] |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | $ 0

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-3 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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