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Balance Sheets (Parentheticals) - $ / shares
$ / shares in Thousands
Dec. 31, 2019
Dec. 31, 2018
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 1,960,000 1,960,000
Common stock, shares issued (in shares) 1,236,744 1,236,744
Common stock, shares outstanding (in shares) 1,236,744 1,236,744