Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

v3.10.0.1
CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
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 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 12,979,414 12,979,414
Treasury stock, shares 1,603,322 1,637,524