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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Equity    
Common stock, par value $ 0 $ 0
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 15,291,884 15,348,086
Common stock, shares outstanding 15,291,884 15,348,086
Own-share Lending Arrangement, Shares, Outstanding 1,459,233 1,459,233