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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Allowance for doubtful trade receivables $ 36us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 108us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common stock, par value (in dollars per share) $ 0us-gaap_CommonStockParOrStatedValuePerShare $ 0us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 75,000,000us-gaap_CommonStockSharesAuthorized 75,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 31,382,000us-gaap_CommonStockSharesIssued 31,333,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 31,382,000us-gaap_CommonStockSharesOutstanding 31,333,000us-gaap_CommonStockSharesOutstanding