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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock [Member] Common Shares Class A Non-Voting [Member] | Common Stock [Member] Common Shares Class B Voting [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2019 |  | $ 8,410 |  | $ 882 |  | $ 101,811 | $ 49,165 | $ 160,268
Balance (in shares) at Dec. 31, 2019 |  | 8,410 | [1],[2],[3] | 882 | [4] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income |  | $ 0 |  | $ 0 |  | 0 | 4,074 | 4,074
Cash dividends declared |  |  |  |  |  |  |  |
Common stock |  | 0 |  | 0 |  | 0 | (2,319) | (2,319)
Issuance of common stock |  |  |  |  |  |  |  |
Dividend reinvestment plan |  | $ 3 |  | $ 0 |  | 105 | 0 | 108
Dividend reinvestment plan (in shares) |  | 3 | [1],[2],[3] | 0 | [4] |  |  |
Employee stock options and awards | [3] | $ 5 |  | $ 0 |  | 129 | 0 | 134
Employee stock options and awards (in shares) | [3] | 5 | [1],[2] | 0 | [4] |  |  |
Employee Retirement Plan | [1] | $ 2 |  | $ 0 |  | 87 | 0 | 89
Employee Retirement Plan (in shares) | [1] | 2 | [2],[3] | 0 | [4] |  |  |
Balance at Mar. 31, 2020 |  | $ 8,420 |  | $ 882 |  | 102,132 | 50,920 | 162,354
Balance (in shares) at Mar. 31, 2020 |  | 8,420 | [1],[2],[3] | 882 | [4] |  |  |
Balance at Dec. 31, 2020 |  | $ 8,475 |  | $ 882 |  | 103,463 | 56,606 | 169,426
Balance (in shares) at Dec. 31, 2020 |  | 8,475 | [1],[2],[3] | 882 | [4] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income |  | $ 0 |  | $ 0 |  | 0 | 4,206 | 4,206
Cash dividends declared |  |  |  |  |  |  |  |
Common stock |  | 0 |  | 0 |  | 0 | (2,406) | (2,406)
Issuance of common stock |  |  |  |  |  |  |  |
Dividend reinvestment plan |  | $ 3 |  | $ 0 |  | 95 | 0 | 98
Dividend reinvestment plan (in shares) |  | 3 | [1],[2],[3] | 0 | [4] |  |  |
Employee stock options and awards | [3] | $ 22 |  | $ 0 |  | 438 | 0 | 460
Employee stock options and awards (in shares) | [3] | 22 | [1],[2] | 0 | [4] |  |  |
Employee Retirement Plan | [1] | $ 2 |  | $ 0 |  | 84 | 0 | 86
Employee Retirement Plan (in shares) | [1] | 2 | [2],[3] | 0 | [4] |  |  |
Balance at Mar. 31, 2021 |  | $ 8,502 |  | $ 882 |  | $ 104,080 | $ 58,406 | $ 171,870
Balance (in shares) at Mar. 31, 2021 |  | 8,502 | [1],[2],[3] | 882 | [4] |  |  |
[1] | Artesian Resources Corporation registered 500,000 shares of Class A Common Stock available for purchase through the Artesian Retirement Plan and the Artesian Supplemental Retirement Plan.
[2] | At March 31, 2021, and March 31, 2020, Class A Common Stock had 15,000,000 shares authorized. For the same periods, shares issued, inclusive of treasury shares, were 8,531,099 and 8,449,292, respectively.
[3] | Under the Equity Compensation Plan, effective December 9, 2015, or the 2015 Plan, Artesian Resources Corporation authorized up to 331,500 shares of Class A Common Stock for issuance of grants in the form of stock options, stock units, dividend equivalents and other stock-based awards, subject to adjustment in certain circumstances as discussed in the 2015 Plan. Includes stock compensation expense for March 31, 2021 and March 31, 2020, see Note 5-Stock Compensation Plans.
[4] | At March 31, 2021, and March 31, 2020, Class B Common Stock had 1,040,000 shares authorized and 881,452 shares issued.

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