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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, 2014 $ 8,030,000 $ 882,000 $ 92,545,000 $ 24,148,000 $ 125,605,000
Balance (in shares) at Dec. 31, 2014 8,030,000 [1],[2],[3] 882,000 [4]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income       11,305,000 11,305,000
Cash dividends declared          
Common stock       (7,811,000) (7,811,000)
Issuance of common stock          
Dividend reinvestment plan $ 18,000   366,000   $ 384,000
Dividends reinvestment plan (in shares) 18,000 [1],[2],[3]       18,000
Employee stock options and awards $ 111,000   2,419,000   $ 2,530,000
Employee stock options and awards (in shares) [1],[2],[3] 111,000        
Employee Retirement Plan [1] $ 17,000   301,000   318,000
Employee Retirement Plan (in shares) [1],[2],[3] 17,000        
Balance at Dec. 31, 2015 $ 8,176,000 $ 882,000 95,631,000 27,642,000 132,331,000
Balance (in shares) at Dec. 31, 2015 8,176,000 [1],[2],[3] 882,000 [4]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income       12,954,000 12,954,000
Cash dividends declared          
Common stock       (8,180,000) (8,180,000)
Issuance of common stock          
Dividend reinvestment plan $ 13,000   387,000   $ 400,000
Dividends reinvestment plan (in shares) 13,000 [1],[2],[3]       13,000
Employee stock options and awards $ 38,000   939,000   $ 977,000
Employee stock options and awards (in shares) [1],[2],[3] 38,000        
Employee Retirement Plan [1] $ 18,000   523,000   541,000
Employee Retirement Plan (in shares) [1],[2],[3] 18,000        
Balance at Dec. 31, 2016 $ 8,245,000 $ 882,000 97,480,000 32,416,000 139,023,000
Balance (in shares) at Dec. 31, 2016 8,245,000 [1],[2],[3] 882,000 [4]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income       13,983,000 13,983,000
Cash dividends declared          
Common stock       (8,496,000) (8,496,000)
Issuance of common stock          
Dividend reinvestment plan $ 11,000   378,000   $ 389,000
Dividends reinvestment plan (in shares) 11,000 [1],[2],[3]       11,000
Employee stock options and awards $ 67,000   1,313,000   $ 1,380,000
Employee stock options and awards (in shares) [1],[2],[3] 67,000        
Employee Retirement Plan [1] $ 10,000   355,000   365,000
Employee Retirement Plan (in shares) [1],[2],[3] 10,000        
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]      
[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, 2017, 2016, and 2015, Class A Common Stock had 15,000,000 shares authorized. For the same periods, shares issued, inclusive of treasury shares, were 8,362,431, 8,275,010 and 8,205,190, 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, 2017, 2016, and 2015, see Note 1-Stock Compensation Plans.
[4] At December 31, 2017, 2016, and 2015, Class B Common Stock had 1,040,000 shares authorized and 882,000 shares issued.