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Note 9 - Net Income Per Share (Details) - Calculation of Earnings Per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income (in Dollars)	$ 5,750us-gaap_NetIncomeLoss	$ 1,761us-gaap_NetIncomeLoss	$ 4,696us-gaap_NetIncomeLoss	$ 6,255us-gaap_NetIncomeLoss	$ 6,822us-gaap_NetIncomeLoss	$ 4,824us-gaap_NetIncomeLoss	$ 4,552us-gaap_NetIncomeLoss	$ 4,731us-gaap_NetIncomeLoss	$ 18,462us-gaap_NetIncomeLoss	$ 20,929us-gaap_NetIncomeLoss	$ 37,211us-gaap_NetIncomeLoss
Numerator:
Basic weighted-average shares outstanding									30,743us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	29,826us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	28,700us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive options and restricted stock									1,196us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	1,567us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	1,109us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted-average shares outstanding									31,939us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	31,393us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	29,809us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per share - Basic (in Dollars per share)	$ 0.19us-gaap_EarningsPerShareBasic	$ 0.06us-gaap_EarningsPerShareBasic	$ 0.15us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.16us-gaap_EarningsPerShareBasic	$ 0.15us-gaap_EarningsPerShareBasic	$ 0.16us-gaap_EarningsPerShareBasic	$ 0.60us-gaap_EarningsPerShareBasic	$ 0.70us-gaap_EarningsPerShareBasic	$ 1.30us-gaap_EarningsPerShareBasic
Net income per share - Diluted (in Dollars per share)	$ 0.18us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ 0.15us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.21us-gaap_EarningsPerShareDiluted	$ 0.15us-gaap_EarningsPerShareDiluted	$ 0.15us-gaap_EarningsPerShareDiluted	$ 0.15us-gaap_EarningsPerShareDiluted	$ 0.58us-gaap_EarningsPerShareDiluted	$ 0.67us-gaap_EarningsPerShareDiluted	$ 1.25us-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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