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CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares
Dec. 31, 2018
Dec. 31, 2017
SHAREHOLDERS' EQUITY:    
Preferred shares, shares authorized (in shares) 1,000,000 1,000,000
Preferred shares, shares outstanding (in shares) 0 0
Common shares, shares authorized (in shares) 19,000,000 19,000,000
Common shares, shares issued (in shares) 14,070,303 10,776,686
Treasury shares at cost (in shares) 775,027 753,627