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Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	The accompanying unaudited financial statements of CKX Lands, Inc. (“Company”) have been prepared in accordance with United States generally accepted accounting principles for interim financial information. They do not include all information and footnotes required by United States generally accepted accounting principles for complete financial statements. Except as described herein, there has been no material change in the information disclosed in the notes to the financial statements included in our financial statements as of and for the year ended December 31, 2016. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included in the accompanying financial statements. Certain amounts have been reclassified to conform to the current period’s presentation, including oil and gas, timber, and surface, from general and administrative costs and expenses on the statements of income. Interim results are not necessarily indicative of results for a full year. These financial statements and accompanying notes should be read in conjunction with the Company’s Form 10 -K for the year ended December 31, 2016 and Form 10 -Q for the quarter period ended September 30, 2017.
New Accounting Pronouncements, Policy [Policy Text Block]	In November 2016, the FASB issued Accounting Standard Update (ASU) No. 2016 - 18, Statement of Cash Flows (Topic 230 ) - Restricted Cash. ASU 2016 - 18 requires that a statement of cash flows explain the change during the period in the total of cash, cash equi valents, and amounts generally described as restricted cash or restricted cash equivalents. This update is for entities for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years using a retrospective transition method to each period presented. Early adoption is permitted. We elected early adoption of this ASU retrospectively as of September 30, 2017.  The adoption had no impact to current or prior period reporting.

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Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).

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Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.

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