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Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Trade accounts receivable - allowance for doubtful accouns $ 340us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 268us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock - par value (in dollars per share) $ 0.1us-gaap_PreferredStockParOrStatedValuePerShare $ 0.1us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock - shares authorized 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock - shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock - shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value (in dollars per share) $ 0.1us-gaap_CommonStockParOrStatedValuePerShare $ 0.1us-gaap_CommonStockParOrStatedValuePerShare
Common stock - shares authorized 40,000,000us-gaap_CommonStockSharesAuthorized 40,000,000us-gaap_CommonStockSharesAuthorized
Common stock - shares issued 18,941,544us-gaap_CommonStockSharesIssued 18,851,579us-gaap_CommonStockSharesIssued
Common stock - shares outstanding 17,340,813us-gaap_CommonStockSharesOutstanding 17,478,822us-gaap_CommonStockSharesOutstanding
Treasury stock - shares 1,600,731us-gaap_TreasuryStockShares 1,372,757us-gaap_TreasuryStockShares