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Note 12 - Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (USD $)	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
Quarterly Financial Data [Abstract]
Revenue	$ 20,067,439us-gaap_SalesRevenueNet	$ 21,487,677us-gaap_SalesRevenueNet	$ (23,751,623)us-gaap_SalesRevenueNet	$ 21,883,517us-gaap_SalesRevenueNet	$ 21,285,992us-gaap_SalesRevenueNet	$ 20,664,645us-gaap_SalesRevenueNet	$ 21,110,452us-gaap_SalesRevenueNet	$ 19,927,433us-gaap_SalesRevenueNet	$ 39,687,010us-gaap_SalesRevenueNet	$ 82,988,522us-gaap_SalesRevenueNet	$ 89,272,582us-gaap_SalesRevenueNet
Gross Profit (loss)	4,276,019us-gaap_GrossProfit	4,471,304us-gaap_GrossProfit	(42,963,154)us-gaap_GrossProfit	4,491,132us-gaap_GrossProfit	5,280,303us-gaap_GrossProfit	4,476,127us-gaap_GrossProfit	4,236,247us-gaap_GrossProfit	4,440,570us-gaap_GrossProfit	(29,724,699)us-gaap_GrossProfit	18,433,247us-gaap_GrossProfit	24,232,613us-gaap_GrossProfit
Net Income (loss)	$ 1,717,259us-gaap_NetIncomeLoss	$ 1,036,548us-gaap_NetIncomeLoss	$ (29,691,951)us-gaap_NetIncomeLoss	$ 1,728,869us-gaap_NetIncomeLoss	$ 2,370,244us-gaap_NetIncomeLoss	$ 1,911,100us-gaap_NetIncomeLoss	$ 1,784,274us-gaap_NetIncomeLoss	$ 1,671,276us-gaap_NetIncomeLoss	$ (25,209,275)us-gaap_NetIncomeLoss	$ 7,736,894us-gaap_NetIncomeLoss	$ 11,011,130us-gaap_NetIncomeLoss
Basic (in Dollars per share)	$ 0.20us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic	$ (3.50)us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic	$ (2.98)us-gaap_EarningsPerShareBasic	$ 0.92us-gaap_EarningsPerShareBasic	$ 1.43us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share)	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ (3.50)us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.28us-gaap_EarningsPerShareDiluted	$ 0.23us-gaap_EarningsPerShareDiluted	$ 0.21us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ (2.98)us-gaap_EarningsPerShareDiluted	$ 0.91us-gaap_EarningsPerShareDiluted	$ 1.40us-gaap_EarningsPerShareDiluted

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- Definition

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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