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STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
STATEMENTS OF COMPREHENSIVE INCOME      
Change in fair value of available-for-sale securities, net of tax expense (benefit) $ 24,713 $ (1,168) $ (10,039)
Realized (gain) loss on available-for-sale securities reclassified to net income, net of tax expense (benefit) $ 2,671 $ (7,269) $ (2,162)