CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)		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, 2017		$ 8,333,000		$ 882,000		$ 99,526,000	$ 37,903,000	$ 146,644,000
Balance (in shares) at Dec. 31, 2017		8,333,000	[1],[2],[3]	882,000	[4]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income							14,278,000	14,278,000
Cash dividends declared
Common stock							(8,819,000)	(8,819,000)
Issuance of common stock
Dividend reinvestment plan		$ 10,000				356,000		$ 366,000
Dividend reinvestment plan (in shares)		10,000	[1],[2],[3]					10,000
Employee stock options and awards	[3]	$ 13,000				306,000		$ 319,000
Employee stock options and awards (in shares)	[1],[2],[3]	13,000
Employee Retirement Plan	[1]	$ 12,000				451,000		463,000
Employee Retirement Plan (in shares)	[1],[2],[3]	12,000
Balance at Dec. 31, 2018		$ 8,368,000		$ 882,000		100,639,000	43,362,000	153,251,000
Balance (in shares) at Dec. 31, 2018		8,368,000	[1],[2],[3]	882,000	[4]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income							14,925,000	14,925,000
Cash dividends declared
Common stock							(9,122,000)	(9,122,000)
Issuance of common stock
Dividend reinvestment plan		$ 11,000				389,000		$ 400,000
Dividend reinvestment plan (in shares)		11,000	[1],[2],[3]					11,000
Employee stock options and awards	[3]	$ 21,000				426,000		$ 447,000
Employee stock options and awards (in shares)	[1],[2],[3]	21,000
Employee Retirement Plan	[1]	$ 10,000				357,000		367,000
Employee Retirement Plan (in shares)	[1],[2],[3]	10,000
Balance at Dec. 31, 2019		$ 8,410,000		$ 882,000		101,811,000	49,165,000	160,268,000
Balance (in shares) at Dec. 31, 2019		8,410,000	[1],[2],[3]	882,000	[4]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income							16,817,000	16,817,000
Cash dividends declared
Common stock							(9,376,000)	(9,376,000)
Issuance of common stock
Dividend reinvestment plan		$ 11,000				377,000		$ 388,000
Dividend reinvestment plan (in shares)		11,000	[1],[2],[3]					11,000
Employee stock options and awards	[3]	$ 42,000				832,000		$ 874,000
Employee stock options and awards (in shares)	[1],[2],[3]	42,000
Employee Retirement Plan	[1]	$ 12,000				443,000		455,000
Employee Retirement Plan (in shares)	[1],[2],[3]	12,000
Balance at Dec. 31, 2020		$ 8,475,000		$ 882,000		$ 103,463,000	$ 56,606,000	$ 169,426,000
Balance (in shares) at Dec. 31, 2020		8,475,000	[1],[2],[3]	882,000	[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 December 31, 2020, 2019, and 2018, Class A Common Stock had 15,000,000 shares authorized.  For the same periods, shares issued, inclusive of treasury shares, were 8,504,429, 8,439,223 and 8,398,005, respectively.

[3] Under the Equity Compensation Plan, effective December 9, 2015, Artesian Resources Corporation authorized up to 331,500 shares of Class A Common Stock for issuance of grants in forms of stock options, stock units, dividend equivalents and other stock-based awards, subject to adjustment in certain circumstances as discussed in the Plan. Includes stock compensation expense for the years ended December 31, 2020, 2019, and 2018, see Note 1-Stock Compensation Plans.

[4] At December 31, 2020, 2019, and 2018, Class B Common Stock had 1,040,000 shares authorized and 882,000 shares issued.