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Note 1 - Separation from Graham Holdings Company and Description of Business	3 Months Ended
	Mar. 31, 2016
Notes to Financial Statements
Business Description and Basis of Presentation [Text Block]	1. SEPARATION FROM GRAHAM HOLDINGS COMPANY AND DESCRIPTION OF BUSINESS On July 1, 2015, Cable One, Inc. (“Cable One”) became an independent company traded under the ticker symbol “CABO” on the New York Stock Exchange after completion of its spin-off from Graham Holdings Company (“GHC”). The spin-off was effected through the distribution by GHC of 100% of the outstanding shares of common stock of Cable One to GHC stockholders as of the record date for the distribution (the “spin-off”) in a pro rata dividend. In connection with the spin-off, approximately 5.84 million shares of Cable One’s common stock were issued and outstanding on July 1, 2015 at 12:01 a.m., based on approximately 0.96 million shares of GHC Class A Common Stock and 4.88 million shares of GHC Class B Common Stock outstanding as of June 30, 2015 . No preferred stock was issued or outstanding. The financial statements included herein have been retroactively restated, including share and per share amounts, to reflect the effects of the spin-off. Cable One owns and operates cable systems that provide data, video and voice services to residential and commercial subscribers in 19 Western, Midwestern and Southern states of the United States of America. As of March 31, 2016, Cable One provided service to 508,424 data customers, 350,576 video customers and 123,910 voice customers. Unless otherwise stated or the context otherwise indicates, all references in this Quarterly Report on Form 10-Q to “Cable One,” “us,” “our,” “we” or the “Company” means Cable One, Inc. and its wholly owned subsidiary, Cable One VoIP LLC (the “Subsidiary”). References in this Quarterly Report on Form 10-Q to “GHC” refer to Graham Holdings Company.

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The entire disclosure for the business description and basis of presentation concepts. Business description describes the nature and type of organization including but not limited to organizational structure as may be applicable to holding companies, parent and subsidiary relationships, business divisions, business units, business segments, affiliates and information about significant ownership of the reporting entity. Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).

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