Note 1 - Description of Business	12 Months Ended
Sep. 27, 2025
Notes to Financial Statements
Business Description and Basis of Presentation [Text Block]	(1) Description of Business Insteel Industries Inc. (“we,” “us,” “our,” “Insteel” or “the Company”) is the nation’s largest manufacturer of steel wire reinforcing products for concrete construction applications. Insteel is the parent holding company for two wholly-owned subsidiaries, Insteel Wire Products Company (“IWP”), an operating subsidiary, and Intercontinental Metals Corporation, an inactive subsidiary. We manufacture and market prestressed concrete strand (“PC strand”) and welded wire reinforcement (“WWR”), including engineered structural mesh, concrete pipe reinforcement and standard welded wire reinforcement. Our products are primarily sold to manufacturers of concrete products and, to a lesser extent, distributors, rebar fabricators and contractors. We sell our products nationwide across the United States (“U.S.”) and, to a much lesser extent, into Canada, Mexico and Central and South America. On October 21, 2024, we, through our wholly-owned subsidiary, IWP, purchased substantially all of the assets, other than cash and accounts receivable, of Engineered Wire Products, Inc. (“EWP”) and certain related assets of Liberty Steel Georgetown, Inc. (“LSG”). See Note 5 to the consolidated financial statements for additional information. On November 26, 2024, we, through our wholly-owned subsidiary IWP, purchased certain assets of O’Brien Wire Products of Texas, Inc. (“OWP”). See Note 5 to the consolidated financial statements for additional information.

Note 1 - Description of Business

12 Months Ended

Sep. 27, 2025

Business Description and Basis of Presentation [Text Block]

(1) Description of Business

Insteel Industries Inc. (“we,” “us,” “our,” “Insteel” or “the Company”) is the nation’s largest manufacturer of steel wire reinforcing products for concrete construction applications. Insteel is the parent holding company for two wholly-owned subsidiaries, Insteel Wire Products Company (“IWP”), an operating subsidiary, and Intercontinental Metals Corporation, an inactive subsidiary. We manufacture and market prestressed concrete strand (“PC strand”) and welded wire reinforcement (“WWR”), including engineered structural mesh, concrete pipe reinforcement and standard welded wire reinforcement. Our products are primarily sold to manufacturers of concrete products and, to a lesser extent, distributors, rebar fabricators and contractors. We sell our products nationwide across the United States (“U.S.”) and, to a much lesser extent, into Canada, Mexico and Central and South America.

On October 21, 2024, we, through our wholly-owned subsidiary, IWP, purchased substantially all of the assets, other than cash and accounts receivable, of Engineered Wire Products, Inc. (“EWP”) and certain related assets of Liberty Steel Georgetown, Inc. (“LSG”). See Note 5 to the consolidated financial statements for additional information.

On November 26, 2024, we, through our wholly-owned subsidiary IWP, purchased certain assets of O’Brien Wire Products of Texas, Inc. (“OWP”). See Note 5 to the consolidated financial statements for additional information.