Note 5 - Private Securities Offerings	12 Months Ended
Dec. 31, 2013
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Note 5. 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 December 31, 2013, we sold 260,000 shares of our common stock to three accredited investors and received $65,000 gross and $59,500 net proceeds from the sales. 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 October 15, 2015, 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. 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 12) began a private securities offering, selling up to 1,000 shares of its common stock at $1,000 per share. Through September 30, 2013, Clyra sold 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. This offering closed in December 2013. (See Note 14, Subsequent Events.) Summer 2012 Offering Pursuant to a private offering of our common stock that commenced May 2012 (the “Summer 2012 Offering”) and closed in November 2012, we sold 2,771,671 shares of our common stock at $0.35 per share to 15 accredited investors and received $970,086 gross, $918,586 net proceeds from the sales. Each purchaser of stock in the Summer 2012 Offering received, for no additional consideration, a stock purchase warrant (the “Summer 2012 Warrant”) entitling the holder to purchase the same number of shares as purchased in the offering, for $0.50 per share until March 31, 2014. (See Note 7.) On October 23, 2012, we amended the original terms of the offering by reducing the price of the common stock sold from $0.40 to $0.35 per share, and reducing the exercise price of the warrant from $0.55 to $0.50 per share. Winter 2012 Offering Pursuant to a private offering of our common stock at a price of $0.35 per share that commenced January 2012 and closed May 2012 (the “Winter 2012 Offering”), we sold 3,127,914 shares of our common stock at $0.35 per share to 30 accredited investors and received $1,094,765 gross and $1,040,315 net proceeds from the sales. Each purchaser of stock in the Winter 2012 Offering received, for no additional consideration, a stock purchase warrant (the “Winter 2012 Warrant”) entitling the holder to purchase the same number of shares as purchased in the offering, for $0.50 per share until June 30, 2013. On June 28, 2013, these Warrants were extended for one year to expire on June 30, 2014. (See Note 7.) Fall 2011 Offering Pursuant to a private offering of our common stock at a price of $0.35 per share that commenced September 2011 and closed December 31, 2011 (the “Fall 2011 Offering”), we sold 1,335,201 shares of our common stock at $0.35 per share to 16 accredited investors and received subscriptions $467,317 gross and net proceeds. In the year ended December 31, 2011, we received $370,723 gross proceeds and issued 1,059,215 shares of our common stock. In January 2012 we received the remaining $96,594 from subscriptions committed prior to the termination of the offering and issued 275,986 shares of our common stock. Each purchaser of stock in the Fall 2011 Offering received, for no additional consideration, a stock purchase warrant (the “Fall 2011 Warrant”) entitling the holder to purchase the same number of shares of common stock for $0.50 per share until December 31, 2012. On December 27, 2012, we extended the expiration date of the warrant by one year, to expire December 31, 2013. These warrant expired unexercised (See Note 7.) Spring 2010 Offering Pursuant to a private offering that commenced January 2010 (the “Spring 2010 Offering”) and terminated July 2010, we sold $438,775 of our 10% convertible notes (the “Spring 2010 Notes”), which are due and payable on April 15, 2013, to 18 investors, the principal amount of which is convertible into an aggregate 763,235 shares of our common stock, at $0.575 per share We converted all of the Spring 2010 Offering notholders on December 27, 2012 by the issuance of stock pursuant to the terms of the notes. (See Note 6.) Spring 2009 Offering Pursuant to a private offering that commenced April 2009 (the “Spring 2009 Offering”) and terminated November 2009, we sold $681,410 of our 10% convertible notes (the “Spring 2009 Notes”), which are due and payable on June 1, 2012, to 23 investors, the principal amount of which is convertible into an aggregate 1,238,935 shares of our common stock at a price of $0.55 per share. These notes were fully paid at maturity by the issuance of stock pursuant to the terms of the notes. (See Note 6.) All of these offerings and sales were made in reliance on the exemption from registration contained in Section4(2) of the Securities Exchange Act and/or RegulationD promulgated thereunder as not involving a public offering of securities.

Note 5 - Private Securities Offerings

12 Months Ended

Dec. 31, 2013

Note 5. 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 December 31, 2013, we sold 260,000 shares of our common stock to three accredited investors and received $65,000 gross and $59,500 net proceeds from the sales.

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 October 15, 2015, 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.

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 12) began a private securities offering, selling up to 1,000 shares of its common stock at $1,000 per share. Through September 30, 2013, Clyra sold 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.

This offering closed in December 2013. (See Note 14, Subsequent Events.)

Summer 2012 Offering

Pursuant to a private offering of our common stock that commenced May 2012 (the “Summer 2012 Offering”) and closed in November 2012, we sold 2,771,671 shares of our common stock at $0.35 per share to 15 accredited investors and received $970,086 gross, $918,586 net proceeds from the sales. Each purchaser of stock in the Summer 2012 Offering received, for no additional consideration, a stock purchase warrant (the “Summer 2012 Warrant”) entitling the holder to purchase the same number of shares as purchased in the offering, for $0.50 per share until March 31, 2014. (See Note 7.) On October 23, 2012, we amended the original terms of the offering by reducing the price of the common stock sold from $0.40 to $0.35 per share, and reducing the exercise price of the warrant from $0.55 to $0.50 per share.

Winter 2012 Offering

Pursuant to a private offering of our common stock at a price of $0.35 per share that commenced January 2012 and closed May 2012 (the “Winter 2012 Offering”), we sold 3,127,914 shares of our common stock at $0.35 per share to 30 accredited investors and received $1,094,765 gross and $1,040,315 net proceeds from the sales.

Each purchaser of stock in the Winter 2012 Offering received, for no additional consideration, a stock purchase warrant (the “Winter 2012 Warrant”) entitling the holder to purchase the same number of shares as purchased in the offering, for $0.50 per share until June 30, 2013. On June 28, 2013, these Warrants were extended for one year to expire on June 30, 2014. (See Note 7.)

Fall 2011 Offering

Pursuant to a private offering of our common stock at a price of $0.35 per share that commenced September 2011 and closed December 31, 2011 (the “Fall 2011 Offering”), we sold 1,335,201 shares of our common stock at $0.35 per share to 16 accredited investors and received subscriptions $467,317 gross and net proceeds. In the year ended December 31, 2011, we received $370,723 gross proceeds and issued 1,059,215 shares of our common stock. In January 2012 we received the remaining $96,594 from subscriptions committed prior to the termination of the offering and issued 275,986 shares of our common stock.

Each purchaser of stock in the Fall 2011 Offering received, for no additional consideration, a stock purchase warrant (the “Fall 2011 Warrant”) entitling the holder to purchase the same number of shares of common stock for $0.50 per share until December 31, 2012. On December 27, 2012, we extended the expiration date of the warrant by one year, to expire December 31, 2013. These warrant expired unexercised (See Note 7.)

Spring 2010 Offering

Pursuant to a private offering that commenced January 2010 (the “Spring 2010 Offering”) and terminated July 2010, we sold $438,775 of our 10% convertible notes (the “Spring 2010 Notes”), which are due and payable on April 15, 2013, to 18 investors, the principal amount of which is convertible into an aggregate 763,235 shares of our common stock, at $0.575 per share We converted all of the Spring 2010 Offering notholders on December 27, 2012 by the issuance of stock pursuant to the terms of the notes. (See Note 6.)

Spring 2009 Offering

Pursuant to a private offering that commenced April 2009 (the “Spring 2009 Offering”) and terminated November 2009, we sold $681,410 of our 10% convertible notes (the “Spring 2009 Notes”), which are due and payable on June 1, 2012, to 23 investors, the principal amount of which is convertible into an aggregate 1,238,935 shares of our common stock at a price of $0.55 per share. These notes were fully paid at maturity by the issuance of stock pursuant to the terms of the notes. (See Note 6.)

All of these offerings and sales were made in reliance on the exemption from registration contained in Section4(2) of the Securities Exchange Act and/or RegulationD promulgated thereunder as not involving a public offering of securities.

- 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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