The provision for depreciation is computed on the straight-line method over the estimated
useful lives of the assets, which range from 3 to 91 years. The weighted average composite
depreciation rate was 2.56% and 2.54% in 2017 and 2016, respectively.
Note 3 — Accounts Receivable
Accounts receivable consisted of the following at December 31, 2017 and 2016:
(in thousands) 2017 2016
Accounts receivable - billed $ 3,457 $ 4,188
Less allowance for doubtful accounts (37) (51)
Accounts Receivable - billed, net $ 3,420 $ 4,137
Accounts receivable - unbilled $ 2,265 $ 1,921
Less allowance for doubtful accounts - -
Accounts Receivable - unbilled, net $ 2,265 $ 1,921
Note 4 — Deferred Charges and Other Assets
Deferred charges and other assets as of December 31, 2017 and 2016 consisted of the
following:
Recovery
Period
(in thousands) 2017 2016 (in years)
Regulatory assets:
Source development charges $ 952 $1,041 5 ~25
Miscellaneous studies 980 854 2 - 25
Unrecovered pension and post-retirement
benefits expense 8,244 7,457 a
Total regulatory assets 10,176 9,352
Supplemental executive retirement plan asset 735 706
Total deferred charges and other assets $ 10,911 $ 10,058
We expect to recover these amounts consistent with the anticipated expense recognition of these assets.
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