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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Accounts receivable, allowance for doubtful accounts $ 670,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 680,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock, par value (in dollars per share) $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized (in shares) 300,000us-gaap_PreferredStockSharesAuthorized 300,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued (in shares) 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock par value (in dollars per share) $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares) 50,000,000us-gaap_CommonStockSharesAuthorized 50,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) 13,614,569us-gaap_CommonStockSharesIssued 13,514,566us-gaap_CommonStockSharesIssued
Common stock, shares outstanding (in shares) 13,614,569us-gaap_CommonStockSharesOutstanding 13,514,566us-gaap_CommonStockSharesOutstanding