Condensed Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,927	$ 1,922
Accumulated depreciation	21,899	21,925
Accumulated amortization	$ 6,045	$ 5,802
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	40,000,000us-gaap_CommonStockSharesAuthorized	40,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares)	23,287,540us-gaap_CommonStockSharesIssued	23,027,704us-gaap_CommonStockSharesIssued
Common stock outstanding (in shares)	23,065,162us-gaap_CommonStockSharesOutstanding	22,860,398us-gaap_CommonStockSharesOutstanding
Treasury stock (in shares)	222,378us-gaap_TreasuryStockShares	167,306us-gaap_TreasuryStockShares

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Face amount or stated value per share of common stock.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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