Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, shares authorized (in shares) 20,000,000 20,000,000
Common stock, shares issued (in shares) 14,910,498 14,695,020
Common stock, shares outstanding (in shares) 14,910,498 14,695,020