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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Common stock, no par value
Common stock, shares authorized 10,000,000 10,000,000
Common stock, shares, issued 5,660,985 5,658,585
Common stock, shares, outstanding 5,660,985 5,658,585