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Note 4 - Fair Value Measurement (Details) - Projected Liabilities Based on Future Revenue (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 4 - Fair Value Measurement (Details) - Projected Liabilities Based on Future Revenue [Line Items]
Project revenue in 2016 (in millions) (in Dollars)	$ 282,535,000us-gaap_Revenues	$ 238,091,000us-gaap_Revenues	$ 213,813,000us-gaap_Revenues
Discount rate	9.00%us-gaap_FairValueInputsDiscountRate
Scenario, Forecast [Member] \| Minimum [Member]
Note 4 - Fair Value Measurement (Details) - Projected Liabilities Based on Future Revenue [Line Items]
Project revenue in 2016 (in millions) (in Dollars)	2,100
Scenario, Forecast [Member] \| Maximum [Member]
Note 4 - Fair Value Measurement (Details) - Projected Liabilities Based on Future Revenue [Line Items]
Project revenue in 2016 (in millions) (in Dollars)	$ 3,800
Minimum [Member]
Note 4 - Fair Value Measurement (Details) - Projected Liabilities Based on Future Revenue [Line Items]
Discount rate	4.00%	3.30%
Probability of occurrence	20.00%
Maximum [Member]
Note 4 - Fair Value Measurement (Details) - Projected Liabilities Based on Future Revenue [Line Items]
Discount rate	7.00%	8.10%
Probability of occurrence	50.00%