Note 5 - Warrants to Purchase Common Stock (Details Textual)	Sep. 30, 2022 USD ($) shares
Class of Warrant or Right, Number of Securities Called by Warrants or Rights, Vested (in shares)	374,449
Class of Warrant or Right, Number of Securities Called by Warrants or Rights, Unvested (in shares)	63,887
Warrant, Nonvested, Cost Not yet Recognized, Amount \| $	$ 244,416

Number of securities into which the class of warrant or right may be converted that are unvested.

No definition available.

Name:	blbx_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRightsUnvested
Namespace Prefix:	blbx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant