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Note 6 - Net Income Per Share (Details) - Calculation of Earnings Per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net income (in Dollars)	$ 5,967us-gaap_NetIncomeLoss	$ 6,255us-gaap_NetIncomeLoss
Denominator:
Basic weighted-average shares outstanding	31,336us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	30,477us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive options and restricted stock	955us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	1,488us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted average shares outstanding	32,291us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	31,965us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per share - Basic (in Dollars per share)	$ 0.19us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic
Net income per share - Diluted (in Dollars per share)	$ 0.18us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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