Exhibit 11 MAHASKA INVESTMENT COMPANY AND SUBSIDIARIES STATEMENT RE: COMPUTATION OF PER SHARE EARNINGS Three Months Ended March 31, ---------------------- 2002 2001 ---------- ---------- Earnings per Share Information: - ------------------------------------- Weighted average number of shares outstanding during the year .................................. 3,871,038 3,953,471 Weighted average number of shares outstanding during the year including all dilutive potential shares ...................... 3,937,121 3,980,934 Net earnings .................................................... $1,417,323 $ 992,137 Earnings per share - basic ...................................... $ 0.37 $ 0.25 Earnings per share - diluted .................................... $ 0.36 $ 0.25