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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2012
Subsequent Events [Abstract]
Subsequent Events	Note 13. Subsequent Events On January 23, 2013, the Company declared a $.04 dividend on its common stock, payable on February 22, 2013 to shareholders of record as of February 8, 2013. During the first quarter of 2013, the Company has sold 7,500 shares of Rudolph Technology stock for proceeds of $104,000 resulting in a gain on the sale of $103,000. On March 18, 2013, the Board of Directors of the Company authorized and approved the Electro-Sensors, Inc. 2013 Equity Incentive Plan (the “2013 Plan”), subject to approval by the stockholders on or before March 18, 2014.