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Consolidated Balance Sheets (Parenthetical) - shares
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Common stock, shares authorized 7,000,000 7,000,000
Common stock, shares issued 3,499,285 3,470,428
Common stock, shares outstanding 3,499,285 3,470,428
Common stock, unvested shares 211,575 191,900
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0