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Note 11 - Related-party Transactions | 12 Months Ended
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Dec. 31, 2024
Notes to Financial Statements |
Related Party Transactions Disclosure [Text Block] | Note 11 — Related-Party Transactions Chief Executive Officer The CEO has a partial interest in a company that the Company has partnered with for its EM-100/Alaway Preservative Free eye allergy product as described below. The Company acquired the exclusive rights to sell the EM-100 product in the United States pursuant to a sales and marketing agreement (the “Eyemax Agreement”) dated August 11, 2017 between the Company and Eyemax LLC (“Eyemax”), an entity affiliated with the Company’s CEO. Under the terms of the original agreement, the Company would pay Eyemax $250 upon FDA approval and $500 upon the first commercial sale of the product and pay Eyemax a royalty of 10% on the net sales of all products. The Eyemax Agreement was for an initial term of 10 years, subject to successive two-year renewals unless the Company elected to terminate the Eyemax Agreement. On February 18, 2019, the Company entered into an Amended and Restated Agreement with Eyemax amending the Sales Agreement (the “Amended Agreement”). Pursuant to the Amended Agreement, Eyemax sold the Company all of its right, title and interest in EM-100, including any such product that incorporates or utilizes Eyemax’s intellectual property rights. Pursuant to the Amended Agreement, the Company paid Eyemax two milestone payments: (i) one milestone payment for $250 upon regulatory approval in the territory by the FDA of the first single agent product and (ii) one milestone payment for $500 following the first commercial sale of the first single agent product in the territory. The Company realized $1,840 of the non-royalty and royalty revenue throughout the life of the product. The EM-100 asset and its associated product rights were sold to Bausch Health on February 18, 2019 and future potential royalties of twelve percent on Bausch Health sales of the product, named Alaway® Preservative Free by Bausch, which was approved by the FDA in September 2020, were to be split between Eyemax and the Company. There were no amounts due to Eyemax under the terms of the Amended Agreement as of December 31, 2024 or December 31, 2023, and Bausch Health discontinued sales of Alaway® Preservative Free effective March 24, 2023. Previously, the Company acquired DS-200 and all related intellectual property pursuant to an asset purchase agreement (the “Selenix Agreement”) dated June 23, 2017 between the Company and Selenix LLC (“Selenix”), an entity affiliated with the CEO. On August 30, 2024, the Company amended the Selenix Agreement in tandem with an agreement to sell DS-200 in August 2024 (see Note 15). Pursuant to the terms of the amended Selenix Agreement, Selenix waived its rights to future milestone payments and 50% of DS-200 profit in exchange for 45% of proceeds received by Eton from the DS-200 sale agreement. Selenix is 50% owned by Messa Holdings LLC (“Messa”), which is 100% owned by the CEO. The Company paid $220 to Selenix in October 2024.

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