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Note 2 - Summary of Significant Accounting Policies (Details Textual)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 6.6us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 14.4us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 13.3us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Maximum [Member]      
Accounting Policies [Abstract]      
Property, Plant and Equipment, Useful Life 5 years    
Minimum [Member]      
Accounting Policies [Abstract]      
Property, Plant and Equipment, Useful Life 3 years