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Document And Entity Information - USD ($)
Dec. 31, 2021
May 26, 2022
Jun. 30, 2021
Document Information [Line Items]      
Entity, Registrant Name CKX Lands, Inc.    
Document, Type 10-K/A    
Document, Annual Report true    
Document, Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document, Fiscal Period Focus FY    
Document, Fiscal Year Focus 2021    
Document, Transition Report false    
Entity, File Number 1-31905    
Entity, Incorporation, State or Country Code LA    
Entity, Tax Identification Number 72-0144530    
Entity, Address, Address Line One 2417 Shell Beach Drive    
Entity, Address, City or Town Lake Charles    
Entity, Address, State or Province LA    
Entity, Address, Postal Zip Code 70601    
City Area Code 337    
Local Phone Number 493-2399    
Title of 12(b) Security Common Stock with no par value    
Trading Symbol CKX    
Security Exchange Name NYSE    
Entity, Well-known Seasoned Issuer No    
Entity, Voluntary Filers No    
Entity, Current Reporting Status Yes    
Entity, Interactive Data, Current Yes    
Entity, Filer Category Non-accelerated Filer    
Entity, Small Business true    
Entity, Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Entity, Shell Company false    
Entity, Public Float     $ 17,094,488
Entity, Common Stock Shares, Outstanding   1,942,495  
Amendment Description This Amendment No. 1 to Form 10-K (this “Amendment No.1” or “Form 10-K/A”) is being filed to amend the Annual Report on Form 10-K for the fiscal year ended December 31, 2021, of CKX Lands, Inc., a Louisiana corporation, originally filed March 28, 2022, with the United States Securities and Exchange Commission, or the “SEC” (the “Original Filing”). We are filing this Amendment No. 1 to include as an exhibit to the Original Filing the consent of our independent registered public accounting firm to the incorporation by reference in our Registration Statement on Form S-8, No. 333-256589 (the “Registration Statement”), of their report dated March 28, 2022 with respect to our financial statements that was included in the Original Filing. As of the filing of this Amendment No. 1, no securities covered by the Registration Statement have ever been sold.   Part IV (Items 15 and 16) of the Original Filing is hereby deleted in its entirety and replaced with the following Part IV set forth below, including to add new exhibits. As required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended, currently dated certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 are attached hereto as Exhibit 31.2 and Exhibit 31.3, respectively. Because no financial statements are included in this Amendment No. 1 and this Amendment No. 1 does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4 and 5 of the certifications have been omitted. Also, we are not including the certifications under Section 906 of Sarbanes-Oxley Act of 2002 as no financial statements are being filed with this Amendment No. 1. Further, we are amending the cover page to update the number of ordinary shares outstanding and to remove the statement that information is being incorporated by reference from our definitive proxy statement.   Except as described above, no other changes have been made to the Original Filing. Accordingly, this Amendment No. 1 should be read in conjunction with the Original Filing and our other filings with the SEC. The Original Filing continues to speak as of its date, and we have not updated the disclosures contained in the Original Filing to reflect any events that occurred after the filing of the Original Filing.   Except where the context indicates otherwise, the terms “Registrant,” “Company,” “we,” “us,” or “our” refer to CKX Lands, Inc.    
Auditor Name MaloneBailey, LLP    
Auditor Location Houston, Texas    
Auditor Firm ID 206    
Amendment Flag true    
Entity, Central Index Key 0000352955