Note 1 - Description of Business	9 Months Ended
Sep. 30, 2023
Notes to Financial Statements
Business Description and Basis of Presentation [Text Block]	Note 1. Description of Business Business Overview Applied Optoelectronics, Inc. ("AOI" or the 'Company") is a Delaware corporation. The Company is a leading, vertically integrated provider of fiber-optic networking products, primarily for four networking end-markets: cable television ("CATV"), internet data center, telecommunications ("telecom") and fiber-to-the-home ("FTTH"). The Company designs and manufactures a wide range of optical communications products at varying levels of integration, from components, subassemblies and modules to complete turn-key equipment. The Company has manufacturing and research and development facilities located in the U.S., Taiwan and China. In the U.S., at its corporate headquarters and manufacturing facilities in Sugar Land, Texas, the Company primarily manufactures lasers and laser components and performs research and development activities for laser component and optical module products. In addition, the Company also has a research and development facility in Duluth, Georgia. The Company operates in Taipei, Taiwan and Ningbo, China through its wholly-owned subsidiary Prime World International Holdings, Ltd. ("Prime World", incorporated in the British Virgin Islands). Prime World operates a branch in Taipei, Taiwan, which primarily manufactures transceivers and performs research and development activities for the transceiver products. Prime World is also the parent of Global Technology, Inc. ("Global", incorporated in the People’s Republic of China). Through Global, the Company primarily manufactures certain of its data center transceiver products, including subassemblies, as well as CATV systems and equipment, and performs research and development activities for the CATV products. Interim Financial Statements The unaudited condensed consolidated financial statements of the Company as of September 30, 2023 and December 31, 2022 and for the three and nine months ended September 30, 2023 and September 30, 2022, have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim information and with the instructions on Form 10-Q and Rule 10-01 of Regulation S-X pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). In accordance with those rules and regulations, the Company has omitted certain information and notes required by GAAP for annual consolidated financial statements. In the opinion of management, the condensed consolidated financial statements contain all adjustments, except as otherwise noted, necessary for the fair presentation of the Company’s financial position and results of operations for the periods presented. The year-end condensed balance sheet data was derived from audited financial statements. These condensed consolidated financial statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K ("Annual Report") for the fiscal year ended December 31, 2022. The results of operations for the three and nine months ended September 30, 2023 are not necessarily indicative of the results expected for the entire fiscal year. All significant inter-company accounts and transactions have been eliminated. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported. Actual results could differ from those estimates in the consolidated financial statements and accompanying notes. Significant estimates and assumptions that impact these financial statements and the accompanying notes relate to, among other things, allowance for doubtful accounts, inventory reserve, impairment of long-lived assets, service and product warranty costs, share-based compensation expense, estimated useful lives of property and equipment, and taxes. Termination of the Divestiture Agreement with Yuhan Optoelectronic Technology (Shanghai) Co., Ltd On September 15, 2022, the Company entered into a definitive purchase agreement (the "Purchase Agreement") with Yuhan Optoelectronic Technology (Shanghai) Co., Ltd (the "Purchaser") to divest the Company's manufacturing facilities located in the People's Republic of China and certain assets related to its transceiver business and multi-channel optical sub-assembly products. On September 12, 2023, the Company delivered a notice of termination to the Purchaser to terminate the Purchase Agreement as a result of the Purchaser's breach of or omission to observe certain of the Purchaser's obligations under the Purchase Agreement. As a result of the Company's delivery of the termination notice, the Purchase Agreement was terminated.

Note 1 - Description of Business

9 Months Ended

Sep. 30, 2023

Business Description and Basis of Presentation [Text Block]

Note 1. Description of Business

Business Overview

Applied Optoelectronics, Inc. ("AOI" or the 'Company") is a Delaware corporation. The Company is a leading, vertically integrated provider of fiber-optic networking products, primarily for four networking end-markets: cable television ("CATV"), internet data center, telecommunications ("telecom") and fiber-to-the-home ("FTTH"). The Company designs and manufactures a wide range of optical communications products at varying levels of integration, from components, subassemblies and modules to complete turn-key equipment.

The Company has manufacturing and research and development facilities located in the U.S., Taiwan and China. In the U.S., at its corporate headquarters and manufacturing facilities in Sugar Land, Texas, the Company primarily manufactures lasers and laser components and performs research and development activities for laser component and optical module products. In addition, the Company also has a research and development facility in Duluth, Georgia. The Company operates in Taipei, Taiwan and Ningbo, China through its wholly-owned subsidiary Prime World International Holdings, Ltd. ("Prime World", incorporated in the British Virgin Islands). Prime World operates a branch in Taipei, Taiwan, which primarily manufactures transceivers and performs research and development activities for the transceiver products. Prime World is also the parent of Global Technology, Inc. ("Global", incorporated in the People’s Republic of China). Through Global, the Company primarily manufactures certain of its data center transceiver products, including subassemblies, as well as CATV systems and equipment, and performs research and development activities for the CATV products.

Interim Financial Statements

The unaudited condensed consolidated financial statements of the Company as of September 30, 2023 and December 31, 2022 and for the three and nine months ended September 30, 2023 and September 30, 2022, have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim information and with the instructions on Form 10-Q and Rule 10-01 of Regulation S-X pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). In accordance with those rules and regulations, the Company has omitted certain information and notes required by GAAP for annual consolidated financial statements. In the opinion of management, the condensed consolidated financial statements contain all adjustments, except as otherwise noted, necessary for the fair presentation of the Company’s financial position and results of operations for the periods presented. The year-end condensed balance sheet data was derived from audited financial statements. These condensed consolidated financial statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K ("Annual Report") for the fiscal year ended December 31, 2022. The results of operations for the three and nine months ended September 30, 2023 are not necessarily indicative of the results expected for the entire fiscal year. All significant inter-company accounts and transactions have been eliminated.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported. Actual results could differ from those estimates in the consolidated financial statements and accompanying notes. Significant estimates and assumptions that impact these financial statements and the accompanying notes relate to, among other things, allowance for doubtful accounts, inventory reserve, impairment of long-lived assets, service and product warranty costs, share-based compensation expense, estimated useful lives of property and equipment, and taxes.

Termination of the Divestiture Agreement with Yuhan Optoelectronic Technology (Shanghai) Co., Ltd

On September 15, 2022, the Company entered into a definitive purchase agreement (the "Purchase Agreement") with Yuhan Optoelectronic Technology (Shanghai) Co., Ltd (the "Purchaser") to divest the Company's manufacturing facilities located in the People's Republic of China and certain assets related to its transceiver business and multi-channel optical sub-assembly products. On September 12, 2023, the Company delivered a notice of termination to the Purchaser to terminate the Purchase Agreement as a result of the Purchaser's breach of or omission to observe certain of the Purchaser's obligations under the Purchase Agreement. As a result of the Company's delivery of the termination notice, the Purchase Agreement was terminated.