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Note 4 - Stock Options and Warrants (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Jul. 20, 2020	Jul. 10, 2020	Jun. 23, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.97	$ 0.97				$ 1.95
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	476,348	476,348
Class of Warrant or Right, Exercised in Period (in shares)		115,385
Warrants in Connection with Common Stock Sold [Member]
Warrants and Rights Outstanding, Term (Year)	5 years	5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 1.95	$ 1.95
Warrants and Rights Outstanding	$ 614,805	$ 614,805
Warrants Issued With Convertible Notes Payable [Member]
Warrants and Rights Outstanding, Term (Year)					1 year
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.01	$ 0.01			$ 0.01
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)					115,385
Class of Warrant or Right, Exercised in Period (in shares)	115,385
Second Warrants Issued With Convertible Notes Payable [Member]
Warrants and Rights Outstanding, Term (Year)			5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 1
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			360,000	360,000

X

- Definition

Represents the number of warrants exercised during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	blbx_
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Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

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X

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

No definition available.

+ Details

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

X

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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X

- Details

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