XML 8 R1.htm IDEA: XBRL DOCUMENT v3.22.1
Document and Entity Information
May 02, 2022
Apr. 25, 2022
Entity Information [Line Items]    
Document Type 8-K  
Document Period End Date May 02, 2022  
Entity Registrant Name AMERICAN STATES WATER CO  
Entity Incorporation, State or Country Code CA  
Entity File Number 001-14431  
Entity Tax Identification Number 95-4676679  
Entity Address, Address Line One 630 East Foothill Blvd.  
Entity Address, City or Town San Dimas  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 91773-1212  
City Area Code 909  
Local Phone Number 394-3600  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Title of 12(b) Security American States Water Company Common Shares  
Trading Symbol AWR  
Security Exchange Name NYSE  
Entity Emerging Growth Company   false
Entity Central Index Key 0001056903  
Amendment Flag false