Subsequent Events	6 Months Ended
Nov. 30, 2017
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Note 6: Subsequent Events Subsequent to November 30, 2017 options to purchase 5,750 shares of the Company’s common stock were exercised at purchase prices ranging from $0.85 to $1.04 per share. Proceeds to the Company totaled approximately $5,125. On December 1, 2017, Biomerica, Inc. (the “Company”) entered into an At Market Issuance Sales Agreement (the “At Market Issuance Sales Agreement”) with an agent (“Agent”), pursuant to which the Company may offer and sell from time to time up to an aggregate of $7,000,000 of shares of the Company’s common stock, par value $0.08 per share (the “Placement Shares”), through the Agent. The Placement Shares have been registered under the Securities Act of 1933, as amended (the “Securities Act”), pursuant to the Registration Statement on Form S-3 (File No. 333-219130) (the “Registration Statement”), which was originally filed with the Securities and Exchange Commission (“SEC”) on June 30, 2017 and declared effective by the SEC on July 20, 2017, the base prospectus contained within the Registration Statement, and a prospectus supplement that was filed with the SEC on December 1, 2017. Sales of the Placement Shares, if any, pursuant to the At Market Issuance Sales Agreement, may be made in sales deemed to be “at the market offerings” as defined in Rule 415 promulgated under the Securities Act. The Agent will act as sales agent and will use commercially reasonable efforts to sell on the Company’s behalf all of the Placement Shares requested to be sold by the Company, consistent with its normal trading and sales practices, on mutually agreed terms between the Agent and the Company. The Company has no obligation to sell any of the Placement Shares under the At Market Issuance Sales Agreement, and may at any time suspend offers under the At Market Issuance Sales Agreement or terminate the At Market Issuance Sales Agreement. The Company intends to use the net proceeds from this offering for general corporate purposes, including, without limitation, sales and marketing activities, clinical studies and product development, making acquisitions of assets, businesses, companies or securities, capital expenditures, and for working capital needs. Under the terms of the At Market Issuance Sales Agreement, the Company will pay the Agent a commission equal to 3.0% of the gross proceeds from each sale of Placement Shares sold through it under the At Market Issuance Sales Agreement. In addition, the Company has agreed to pay certain expenses incurred by the Agent in connection with the offering. On January 10, 2018, Biomerica issued a press release announcing that the China Food and Drug Administration (CFDA) approved Biomerica’s colorectal screening test to help identify the early warning signs of colorectal cancer. The EZ Detect colorectal screening test detects fecal occult (hidden) blood, an early warning sign of colorectal cancer. On January 8, 2018, Biomerica announced that the Company signed definitive agreements with two leading research institutes to perform the clinical trials needed to validate the performance of its InFoods® product to alleviate Irritable Bowel Syndrome (IBS) symptoms. The Biomerica InFoods® IBS product is designed to allow physicians to identify patient specific foods (e.g. eggs, milk, wheat, sugar, corn, etc.), that when removed, may alleviate or improve an individual's IBS symptoms including but not limited to constipation, diarrhea, bloating, pain and indigestion. The clinical studies will be conducted at Beth Israel Deaconess Medical Center Inc., a Harvard Medical School Teaching Hospital, and the University of Michigan. The initial clinical study will include approximately 180 patients and is expected to take between 9 and 14 months to complete. The results of this initial clinical study will be used to identify the primary endpoint(s) to be used in the pivotal study that will be required prior to submitting a 510(k) application to the FDA. The Company decided to conduct the InFoods® clinical program in two parts. This initial clinical study will be used to predominantly determine the primary end point(s) for the second part which will be the pivotal study. The study will also stratify enrollment by the three main IBS subclasses (IBS-Constipation, IBS-Diarrhea and IBS-Mixed).

Note 6: Subsequent Events

Subsequent to November 30, 2017 options to purchase 5,750 shares of the Company’s common stock were exercised at purchase prices ranging from $0.85 to $1.04 per share. Proceeds to the Company totaled approximately $5,125.

On December 1, 2017, Biomerica, Inc. (the “Company”) entered into an At Market Issuance Sales Agreement (the “At Market Issuance Sales Agreement”) with an agent (“Agent”), pursuant to which the Company may offer and sell from time to time up to an aggregate of $7,000,000 of shares of the Company’s common stock, par value $0.08 per share (the “Placement Shares”), through the Agent.

The Placement Shares have been registered under the Securities Act of 1933, as amended (the “Securities Act”), pursuant to the Registration Statement on Form S-3 (File No. 333-219130) (the “Registration Statement”), which was originally filed with the Securities and Exchange Commission (“SEC”) on June 30, 2017 and declared effective by the SEC on July 20, 2017, the base prospectus contained within the Registration Statement, and a prospectus supplement that was filed with the SEC on December 1, 2017.

Sales of the Placement Shares, if any, pursuant to the At Market Issuance Sales Agreement, may be made in sales deemed to be “at the market offerings” as defined in Rule 415 promulgated under the Securities Act. The Agent will act as sales agent and will use commercially reasonable efforts to sell on the Company’s behalf all of the Placement Shares requested to be sold by the Company, consistent with its normal trading and sales practices, on mutually agreed terms between the Agent and the Company.

The Company has no obligation to sell any of the Placement Shares under the At Market Issuance Sales Agreement, and may at any time suspend offers under the At Market Issuance Sales Agreement or terminate the At Market Issuance Sales Agreement. The Company intends to use the net proceeds from this offering for general corporate purposes, including, without limitation, sales and marketing activities, clinical studies and product development, making acquisitions of assets, businesses, companies or securities, capital expenditures, and for working capital needs.

Under the terms of the At Market Issuance Sales Agreement, the Company will pay the Agent a commission equal to 3.0% of the gross proceeds from each sale of Placement Shares sold through it under the At Market Issuance Sales Agreement. In addition, the Company has agreed to pay certain expenses incurred by the Agent in connection with the offering.

On January 10, 2018, Biomerica issued a press release announcing that the China Food and Drug Administration (CFDA) approved Biomerica’s colorectal screening test to help identify the early warning signs of colorectal cancer. The EZ Detect colorectal screening test detects fecal occult (hidden) blood, an early warning sign of colorectal cancer.

On January 8, 2018, Biomerica announced that the Company signed definitive agreements with two leading research institutes to perform the clinical trials needed to validate the performance of its InFoods® product to alleviate Irritable Bowel Syndrome (IBS) symptoms. The Biomerica InFoods® IBS product is designed to allow physicians to identify patient specific foods (e.g. eggs, milk, wheat, sugar, corn, etc.), that when removed, may alleviate or improve an individual's IBS symptoms including but not limited to constipation, diarrhea, bloating, pain and indigestion. The clinical studies will be conducted at Beth Israel Deaconess Medical Center Inc., a Harvard Medical School Teaching Hospital, and the University of Michigan. The initial clinical study will include approximately 180 patients and is expected to take between 9 and 14 months to complete. The results of this initial clinical study will be used to identify the primary endpoint(s) to be used in the pivotal study that will be required prior to submitting a 510(k) application to the FDA. The Company decided to conduct the InFoods® clinical program in two parts. This initial clinical study will be used to predominantly determine the primary end point(s) for the second part which will be the pivotal study. The study will also stratify enrollment by the three main IBS subclasses (IBS-Constipation, IBS-Diarrhea and IBS-Mixed).