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Note 13 - Selected Quarterly Financial Data (Unaudited) (Details) - Selected Quarterly Financial Data (Unaudited) (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
Selected Quarterly Financial Data (Unaudited) [Abstract]
Total revenues	$ 26,061us-gaap_Revenues	$ 22,406us-gaap_Revenues	$ 24,610us-gaap_Revenues	$ 27,086us-gaap_Revenues	$ 27,078us-gaap_Revenues	$ 25,489us-gaap_Revenues	$ 24,776us-gaap_Revenues	$ 24,110us-gaap_Revenues	$ 100,163us-gaap_Revenues	$ 101,453us-gaap_Revenues	$ 89,540us-gaap_Revenues
Gross profit	16,513us-gaap_GrossProfit	10,792us-gaap_GrossProfit	15,763us-gaap_GrossProfit	17,381us-gaap_GrossProfit	17,513us-gaap_GrossProfit	14,982us-gaap_GrossProfit	15,035us-gaap_GrossProfit	14,453us-gaap_GrossProfit	60,449us-gaap_GrossProfit	61,983us-gaap_GrossProfit	53,043us-gaap_GrossProfit
Net income	$ 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
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
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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