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Fair Value Measures and Disclosures (Tables)
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of Allocation of Plan Assets
The following tables summarize the fair values of the Rabbi Trust investment assets to fund CTWS’s additional retirement benefits under the supplemental executive retirement plans and retirement contracts by major categories as of March 31, 2021, and December 31, 2020: 
 Fair Value Measurements at March 31, 2021
Asset CategoryTotalQuoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)
Significant
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Money market funds$145 145 — — 
Mutual funds2,034 2,034 — — 
Fixed income830 830 — — 
Total$3,009 3,009 — — 
 Fair Value Measurements at December 31, 2020
Asset CategoryTotalQuoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)
Significant
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Money market funds$83 83 — — 
Mutual funds2,101 2,101 — — 
Fixed income830 830 — — 
Total$3,014 3,014 — —