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Note Receivable and Customers' Advances for Construction (Tables)
12 Months Ended
Dec. 31, 2020
Note Receivable and Customers' Advances for Construction [Abstract]  
Amounts Related to Water District Projects
Included in the accompanying balance sheets at December 31, 2020 and 2019 were the following amounts related to this project.

 
2020
  
2019
 
Note receivable, including interest
 
$
255
  
$
255
 
Customers’ advances for construction
  
302
   
303