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Note 10 - Income Taxes (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Percent 38.50% 38.80% (1537.80%)
Unrecognized Tax Benefits $ 0 $ 0 $ 14,800,000
Domestic Tax Authority [Member]      
Operating Loss Carryforwards 15,300,000    
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards $ 64,800,000