Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY (Details)

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STOCKHOLDERS' EQUITY (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Stockholders' Equity Note [Abstract]    
Treasury stock (shares) 5,324,742 2,876,317
Treasury stock, value $ 6,890,349 $ 3,582,805