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Note 4 - Stock Options and Warrants (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Aug. 29, 2019	Jun. 04, 2019	May 22, 2019	Apr. 10, 2019	Dec. 31, 2018
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 1.95
Class of Warrant or Right, Issued in Period	71,795	0
Class of Warrant or Right, Outstanding	71,795
Warrants in Connection with Common Stock Sold [Member]
Warrants and Rights Outstanding, Term	5 years		5 years	5 years	5 years	5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 1.95		$ 1.95	$ 1.95	$ 1.95	$ 1.95
Warrants and Rights Outstanding	$ 502,398

X

- Definition

Number of warrants or rights issued during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	blbx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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X

- Definition

Number of warrants or rights outstanding.

+ References

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

+ Details

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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

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

+ Details

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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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Balance Type:
Period Type: