Note 1 - Description of Business	3 Months Ended
Dec. 31, 2025
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. Description of Business Overview Bridgeline Digital is an AI-powered marketing technology company that offers a suite of products that help companies grow online revenue by driving more visitors to their websites, converting more visitors to purchasers, and increasing average order value per purchaser. Bridgeline’s software is available through a cloud-based Software as a Service (“SaaS”) model. Additionally, Bridgeline’s software is available via a perpetual licensing business model, in which the software can reside on premise at the customer’s facility, or manage-hosted by Bridgeline. Bridgeline’s product offerings include: ● HawkSearch: a site search, recommendation, and personalization software application, built for marketers to enhance, normalize, and enrich an online customer's content search and product discovery experience. ● Celebros Search: a commerce-oriented site search product that provides Natural Language Processing with artificial intelligence to present relevant search results based on long-tail keyword searches. ● Woorank: a Search Engine Optimization (“SEO”) audit tool that generates an instant performance audit of the site’s technical, on-page, and off-page SEO. ● Unbound: a Digital Experience Platform that includes Web Content Management, eCommerce, Digital Marketing, and Web Analytics. ● TruPresence: a web content management and eCommerce platform that supports the needs of multi-unit organizations and franchises. ● OrchestraCMS: the only content and digital experience platform built 100% native on Salesforce and helps customers create websites and intranets for their customers, partners, and employees. Bridgeline Digital was incorporated under the laws of the State of Delaware on August 28, 2000. The Company has four wholly-owned subsidiaries: Bridgeline Digital Pvt. Ltd., located in Bangalore, India; Bridgeline Digital Canada, Inc., located in Ontario, Canada; Hawk Search Inc. located in Rosemont, Illinois and Bridgeline Digital Belgium BV, located in Brussels, Belgium. The Company’s corporate headquarters is located in Woburn, Massachusetts. The Company maintains regional field offices serving the following geographical locations: Garden City, New York; Rosemont, Illinois; Atascadero, California; Ontario, Canada; and Brussels, Belgium. Liquidity and Management’s Plans The Company has historically incurred operating losses and used cash on hand and from financing activities to fund operations as well as develop new products. The Company is continuing to maintain tight control over discretionary spending for the 2026 fiscal year. The Company believes that future revenues and cash flows will supplement its working capital and it has an appropriate cost structure to support future revenue growth. The Company may offer and sell, from time to time, in one or more offerings, up to $50 million of its debt or equity securities, or any combination thereof. Such securities offerings may be made pursuant to the Company’s currently effective registration statement on Form S-3 (File No. 333-285176), which was initially filed with the Securities and Exchange Commission on February 24, 2025 and declared effective on February 27, 2025 (the “Shelf Registration Statement”). A complete description of the types of securities that the Company may sell is described in the Preliminary Prospectus contained in the Shelf Registration Statement. As of the date of the filing of this Quarterly Report, there are no active offerings for the sale or obligations to purchase any of the Company’s securities pursuant to the Shelf Registration Statement. There can be no assurances that the Company will offer any securities for sale or that if the Company does offer any securities that it will be successful in selling any portion of the securities offered on a timely basis if at all, or on terms acceptable to us. Further, our ability to offer or sell such securities may be limited by rules of the NASDAQ Capital Market. As of December 31, 2025 approximately $47.7 million remains available for issuance. On March 24, 2025, the Company entered into a Securities Purchase Agreement with purchasers, pursuant to which the Company agreed to issue and sell, in a registered direct offering, an aggregate of 1,000,000 shares of the Company’s common stock, par value $0.001 per share, at an offering price of $1.50 per share, for aggregate gross proceeds from the offering of approximately $1.5 million before deducting the placement agent fee and related offering expenses (see Note 8). Proceeds after deducting offering expenses was $1.3 million. On March 25, 2025, the Company separately entered into a form of subscription agreement with certain accredited investors relating to a private placement transaction and sale (the “Private Placement”) of 473,979 unregistered shares of the Company’s common stock at an offering price of $1.52 per share, for aggregate gross proceeds from the Private Placement of approximately $720 thousand before deducting related offering expenses. Proceeds after deducting offering expenses was $700 thousand.

Note 1 - Description of Business

3 Months Ended

Dec. 31, 2025

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

1. Description of Business

Overview

Bridgeline Digital is an AI-powered marketing technology company that offers a suite of products that help companies grow online revenue by driving more visitors to their websites, converting more visitors to purchasers, and increasing average order value per purchaser.

Bridgeline’s software is available through a cloud-based Software as a Service (“SaaS”) model. Additionally, Bridgeline’s software is available via a perpetual licensing business model, in which the software can reside on premise at the customer’s facility, or manage-hosted by Bridgeline. Bridgeline’s product offerings include:

● HawkSearch: a site search, recommendation, and personalization software application, built for marketers to enhance, normalize, and enrich an online customer's content search and product discovery experience.

● Celebros Search: a commerce-oriented site search product that provides Natural Language Processing with artificial intelligence to present relevant search results based on long-tail keyword searches.

● Woorank: a Search Engine Optimization (“SEO”) audit tool that generates an instant performance audit of the site’s technical, on-page, and off-page SEO.

● Unbound: a Digital Experience Platform that includes Web Content Management, eCommerce, Digital Marketing, and Web Analytics.

● TruPresence: a web content management and eCommerce platform that supports the needs of multi-unit organizations and franchises.

● OrchestraCMS: the only content and digital experience platform built 100% native on Salesforce and helps customers create websites and intranets for their customers, partners, and employees.

Bridgeline Digital was incorporated under the laws of the State of Delaware on August 28, 2000.

The Company has four wholly-owned subsidiaries: Bridgeline Digital Pvt. Ltd., located in Bangalore, India; Bridgeline Digital Canada, Inc., located in Ontario, Canada; Hawk Search Inc. located in Rosemont, Illinois and Bridgeline Digital Belgium BV, located in Brussels, Belgium.

The Company’s corporate headquarters is located in Woburn, Massachusetts. The Company maintains regional field offices serving the following geographical locations: Garden City, New York; Rosemont, Illinois; Atascadero, California; Ontario, Canada; and Brussels, Belgium.

Liquidity and Management’s Plans

The Company has historically incurred operating losses and used cash on hand and from financing activities to fund operations as well as develop new products. The Company is continuing to maintain tight control over discretionary spending for the 2026 fiscal year. The Company believes that future revenues and cash flows will supplement its working capital and it has an appropriate cost structure to support future revenue growth.

The Company may offer and sell, from time to time, in one or more offerings, up to $50 million of its debt or equity securities, or any combination thereof. Such securities offerings may be made pursuant to the Company’s currently effective registration statement on Form S-3 (File No. 333-285176), which was initially filed with the Securities and Exchange Commission on February 24, 2025 and declared effective on February 27, 2025 (the “Shelf Registration Statement”). A complete description of the types of securities that the Company may sell is described in the Preliminary Prospectus contained in the Shelf Registration Statement. As of the date of the filing of this Quarterly Report, there are no active offerings for the sale or obligations to purchase any of the Company’s securities pursuant to the Shelf Registration Statement. There can be no assurances that the Company will offer any securities for sale or that if the Company does offer any securities that it will be successful in selling any portion of the securities offered on a timely basis if at all, or on terms acceptable to us. Further, our ability to offer or sell such securities may be limited by rules of the NASDAQ Capital Market. As of December 31, 2025 approximately $47.7 million remains available for issuance.

On March 24, 2025, the Company entered into a Securities Purchase Agreement with purchasers, pursuant to which the Company agreed to issue and sell, in a registered direct offering, an aggregate of 1,000,000 shares of the Company’s common stock, par value $0.001 per share, at an offering price of $1.50 per share, for aggregate gross proceeds from the offering of approximately $1.5 million before deducting the placement agent fee and related offering expenses (see Note 8). Proceeds after deducting offering expenses was $1.3 million.

On March 25, 2025, the Company separately entered into a form of subscription agreement with certain accredited investors relating to a private placement transaction and sale (the “Private Placement”) of 473,979 unregistered shares of the Company’s common stock at an offering price of $1.52 per share, for aggregate gross proceeds from the Private Placement of approximately $720 thousand before deducting related offering expenses. Proceeds after deducting offering expenses was $700 thousand.