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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
ASSETS |  |
Utility plant, at original cost (less accumulated depreciation - 2020 - $147,469,; 2019 - $136,588) | $ 559,561 | $ 530,721
Current assets |  |
Cash and cash equivalents | 28 | 596
Accounts receivable (less allowance for doubtful accounts 2020 - $862; 2019-$264) | 10,162 | 6,913
Income tax receivable | 629 | 19
Unbilled operating revenues | 1,166 | 1,211
Materials and supplies | 1,535 | 1,264
Prepaid property taxes | 1,891 | 1,954
Prepaid expenses and other | 2,208 | 2,250
Total current assets | 17,619 | 14,207
Other assets |  |
Non-utility property (less accumulated depreciation - 2020- $865; 2019 - $790) | 3,796 | 3,812
Other deferred assets | 5,309 | 4,257
Operating lease right of use assets | 460 | 480
Total other assets | 9,565 | 8,549
Regulatory assets, net | 6,473 | 6,891
Total assets | 593,218 | 560,368
Stockholders' equity |  |
Common stock | 9,357 | 9,292
Preferred stock | 0 | 0
Additional paid-in capital | 103,463 | 101,811
Retained earnings | 56,606 | 49,165
Total stockholders' equity | 169,426 | 160,268
Long-term debt, net of current portion | 142,333 | 144,156
Total stockholders' equity and long-term debt | 311,759 | 304,424
Current liabilities |  |
Lines of credit | 26,813 | 7,500
Current portion of long-term debt | 1,757 | 1,706
Accounts payable | 6,341 | 8,176
Accrued expenses | 3,414 | 3,113
Overdraft payable | 105 | 15
Accrued interest | 930 | 830
Income taxes payable | 237 | 343
Customer and other deposits | 2,060 | 1,970
OtherLiabilitiesCurrent | 2,067 | 1,946
Total current liabilities | 43,724 | 25,599
Commitments and contingencies (Note 11) |  |
Deferred credits and other liabilities |  |
Net advances for construction | 4,578 | 5,421
OperatingLeaseLiabilityNoncurrent | 432 | 450
Regulatory liabilities | 21,681 | 22,246
Deferred investment tax credits | 473 | 490
Deferred income taxes | 50,313 | 52,259
Total deferred credits and other liabilities | 77,477 | 80,866
Net contributions in aid of construction | 160,258 | 149,479
Total Liabilities and Stockholders' Equity | $ 593,218 | $ 560,368

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant