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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Common Stock, par value (in dollars per share) $ 0.001 $ 0.001
Common Stock, shares authorized 100,000,000 100,000,000
Common Stock, shares outstanding 34,503,704 34,578,040
Treasury Stock, Common, Shares 1,944,054 1,850,603
Series A Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 1,111,111 1,111,111
Preferred Stock, Shares Outstanding 0 0
Series B Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 555,555 555,555
Preferred Stock, Shares Outstanding 0 0