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Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2018
Mar. 15, 2019
Jun. 30, 2018
Document and Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Trading Symbol CIZN    
Entity Registrant Name CITIZENS HOLDING CO /MS/    
Entity Central Index Key 0001075706    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   4,904,530  
Entity Public Float     $ 104,737,263
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Small Business false