Note 4 - Private Securities Offerings	3 Months Ended
Mar. 31, 2014
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Note 4. Private Securities Offerings Summer 2013 Private Securities Offering Pursuant to a private offering of our common stock at a price of $0.25 per share that commenced June 2013, through its expiration on March 31, 2014, we sold 3,370,000 shares of our common stock to 23 accredited investors and received $842,500 gross and $837,000 net cash proceeds from the sales. In addition, we received a subscription agreement for $20,000 through an individual retirement account, the funds for which had not been received by March 31, 2014. Of the aggregate 3,370,000 shares sold in the offering, for the three-month period ended March 31, 2104, we sold 3,110,000 shares of our common stock and received $777,500 gross proceeds from the sales. Fees related to this offering consisted of $5,500 cash payments, and an additional $47,100 in fees are due in shares of our common stock. Each purchaser of stock will receive, for no additional consideration, a stock purchase warrant which entitles the holder to purchase a number of additional shares of our common stock equal to the number of shares originally purchased. The warrant is exercisable at $0.30 per share, will expire on December 31, 2016, and is subject to a call provision in the event BioLargo’s common stock price reaches $0.60 per share over a period of 40 days. Clyra Spring 2014 Private Securities Offering On February 1, 2014, our subsidiary Clyra (see Note 11) began a private securities offering, selling up to 1,000 shares of its common stock at $1,000 per share. On March 14, 2014, Clyra sold 50 shares of its common stock to one accredited investor and received $50,000 gross and net proceeds from the sale. Each purchaser of stock will receive, for no additional consideration, a stock purchase warrant entitling the holder to purchase the same number of shares as purchased in the offering, for $0.55 per share until July 30, 2015. Winter 2013 Private Securities Offering Pursuant to a private offering of our common stock at a price of $0.30 per share that commenced January 2013, through its expiration on June 14, 2013, we sold 2,333,329 shares of our common stock to 13 accredited investors and received $700,000 gross and $633,000 net proceeds from the sales. Each purchaser of stock will receive, for no additional consideration, a stock purchase warrant entitling the holder to purchase the same number of shares as purchased in the offering, for $0.55 per share until July 30, 2015. Clyra Winter 2012 Private Securities Offering On December 17, 2012, our subsidiary Clyra (see Note 11) began a private securities offering, selling up to 1,000 shares of its common stock at $1,000 per share. The offering ended December 31, 2013 and Clyra sold an aggregate 240 shares of its common stock to four accredited investors and received $240,000 gross and $236,000 net proceeds from the sale. In April 2013, Clyra modified the terms of its offering, such that, in addition to shares of Clyra common stock, each Clyra investor would receive a warrant (“Clyra 2012 Warrants”) to purchase an additional number of shares of Clyra common stock as originally purchased by the investor, at a price of $1,833 per share, until July 30, 2015. The offering terms were also modified to increase the number of shares of BioLargo common stock into which the Clyra investor could convert his or her Clyra shares, from 2,858 to 3,333 and 1/3 shares of BioLargo common stock. The date until which the investor may tender Clyra shares to BioLargo for conversion was extended to July 30, 2015. The Clyra investors will not receive any further warrants to purchase additional BioLargo common stock.

Note 4 - Private Securities Offerings

3 Months Ended

Mar. 31, 2014

Note 4. Private Securities Offerings

Summer 2013 Private Securities Offering

Pursuant to a private offering of our common stock at a price of $0.25 per share that commenced June 2013, through its expiration on March 31, 2014, we sold 3,370,000 shares of our common stock to 23 accredited investors and received $842,500 gross and $837,000 net cash proceeds from the sales. In addition, we received a subscription agreement for $20,000 through an individual retirement account, the funds for which had not been received by March 31, 2014. Of the aggregate 3,370,000 shares sold in the offering, for the three-month period ended March 31, 2104, we sold 3,110,000 shares of our common stock and received $777,500 gross proceeds from the sales. Fees related to this offering consisted of $5,500 cash payments, and an additional $47,100 in fees are due in shares of our common stock.

Each purchaser of stock will receive, for no additional consideration, a stock purchase warrant which entitles the holder to purchase a number of additional shares of our common stock equal to the number of shares originally purchased. The warrant is exercisable at $0.30 per share, will expire on December 31, 2016, and is subject to a call provision in the event BioLargo’s common stock price reaches $0.60 per share over a period of 40 days.

Clyra Spring 2014 Private Securities Offering

On February 1, 2014, our subsidiary Clyra (see Note 11) began a private securities offering, selling up to 1,000 shares of its common stock at $1,000 per share. On March 14, 2014, Clyra sold 50 shares of its common stock to one accredited investor and received $50,000 gross and net proceeds from the sale.

Each purchaser of stock will receive, for no additional consideration, a stock purchase warrant entitling the holder to purchase the same number of shares as purchased in the offering, for $0.55 per share until July 30, 2015.

Winter 2013 Private Securities Offering

Pursuant to a private offering of our common stock at a price of $0.30 per share that commenced January 2013, through its expiration on June 14, 2013, we sold 2,333,329 shares of our common stock to 13 accredited investors and received $700,000 gross and $633,000 net proceeds from the sales.

Clyra Winter 2012 Private Securities Offering

On December 17, 2012, our subsidiary Clyra (see Note 11) began a private securities offering, selling up to 1,000 shares of its common stock at $1,000 per share. The offering ended December 31, 2013 and Clyra sold an aggregate 240 shares of its common stock to four accredited investors and received $240,000 gross and $236,000 net proceeds from the sale.

In April 2013, Clyra modified the terms of its offering, such that, in addition to shares of Clyra common stock, each Clyra investor would receive a warrant (“Clyra 2012 Warrants”) to purchase an additional number of shares of Clyra common stock as originally purchased by the investor, at a price of $1,833 per share, until July 30, 2015. The offering terms were also modified to increase the number of shares of BioLargo common stock into which the Clyra investor could convert his or her Clyra shares, from 2,858 to 3,333 and 1/3 shares of BioLargo common stock. The date until which the investor may tender Clyra shares to BioLargo for conversion was extended to July 30, 2015. The Clyra investors will not receive any further warrants to purchase additional BioLargo common stock.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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