Note 4 - Convertible Notes Payable and Line of Credit - Schedule of Debt (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Convertible notes, Current	$ 330,000	$ 610,000
Convertible notes	5,430,668	5,250,668
Total:	5,760,668	5,860,668
Convertible Notes Maturing on July 8, 2017 [Member]
Convertible notes, Current		280,000
Line of Credit, Matures December 1, 2017 [Member]
Convertible notes, Current	50,000	50,000
Convertible Notes Maturing on December 30, 2017 [Member]
Convertible notes, Current	280,000	280,000
Convertible Notes Maturing on June 1, 2018 [Member]
Convertible notes	4,680,097	4,800,097
Clyra Line of Credit, Matures March 31, 2019 [Member]
Convertible notes	175,000
Convertible Notes Maturing on September 17, 2019 [Member]
Convertible notes	283,571	283,571
Convertible Notes Maturing on December 31, 2019 [Member]
Convertible notes	$ 292,000	$ 167,000

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtLongtermAndShorttermCombinedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=blgo_ConvertibleNotesMaturingOnJuly82017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=blgo_LineOfCreditMaturesDecember12017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=blgo_ConvertibleNotesMaturingOnDecember302017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=blgo_ConvertibleNotesMaturingOnJune12018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=blgo_ClyraLineOfCreditMaturesMarch312019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=blgo_ConvertibleNotesMaturingOnSeptember172019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=blgo_ConvertibleNotesMaturingOnDecember312019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: