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Balance Sheets (Unaudited) (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Statement Of Financial Position [Abstract]    
Common stock, shares authorized 8,000,000us-gaap_CommonStockSharesAuthorized 8,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value (in dollars per share) $ 0.10us-gaap_CommonStockParOrStatedValuePerShare $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares issued 3,261,148us-gaap_CommonStockSharesIssued 3,261,148us-gaap_CommonStockSharesIssued
Treasury stock, shares 233,114us-gaap_TreasuryStockShares 234,114us-gaap_TreasuryStockShares