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Consolidated Balance Sheets (Parentheticals) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Loans receivable, allowance for loan losses $ 7,107,418 $ 5,742,449
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, authorized (in shares) 10,000,000 10,000,000
Common stock issued (in shares) 6,878,503 6,875,503
Treasury stock, shares (in shares) 2,453,728 2,465,476