Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

+ 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_ConvertibleLongTermNotesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=blgo_The2015UnitOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=blgo_PricingSupplementNo1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=blgo_PricingSupplementNo2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=blgo_PricingSupplementNo3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=blgo_PricingSupplementNo4Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=blgo_PricingSupplementNo5Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 4 - Debt Obligations - Pricing Supplements (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2015
Conversion Price (in dollars per share)				$ 0.25
Aggregate Outstanding	$ 5,255,668	$ 5,250,668	$ 3,245,972
The 2015 Unit Offering [Member]
Aggregate Outstanding	$ 4,680,097	$ 4,811,713
Pricing Supplement No.1 [Member] \| The 2015 Unit Offering [Member]
Conversion Price (in dollars per share)	$ 0.25	$ 0.25
Warrant Exercise Price (in dollars per share)	$ 0.40	$ 0.40
Aggregate Outstanding	$ 1,652,384	$ 460,000
Pricing Supplement No.2 [Member] \| The 2015 Unit Offering [Member]
Conversion Price (in dollars per share)	$ 0.35	$ 0.25
Warrant Exercise Price (in dollars per share)	$ 0.45	$ 0.40
Aggregate Outstanding	$ 1,881,046	$ 1,100,000
Pricing Supplement No.3 [Member] \| The 2015 Unit Offering [Member]
Conversion Price (in dollars per share)	$ 0.55	$ 0.35
Warrant Exercise Price (in dollars per share)	$ 0.70	$ 0.45
Aggregate Outstanding	$ 1,146,667	$ 1,546,713
Pricing Supplement No.4 [Member] \| The 2015 Unit Offering [Member]
Conversion Price (in dollars per share)		$ 0.35
Warrant Exercise Price (in dollars per share)		$ 0.45
Aggregate Outstanding		$ 550,000
Pricing Supplement No.5 [Member] \| The 2015 Unit Offering [Member]
Conversion Price (in dollars per share)		$ 0.55
Warrant Exercise Price (in dollars per share)		$ 0.70
Aggregate Outstanding		$ 1,155,000