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Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Jun. 30, 2022
Dec. 31, 2021
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, authorized shares (in shares) 20,000,000 20,000,000
Common stock, issued shares (in shares) 14,436,786 14,350,786
Common stock, outstanding shares (in shares) 14,434,468 14,350,451
Treasury stock, shares (in shares) 4,318 335