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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Impairment of Deferred Development Costs $ 0 $ 0
Asset Impairment Charges $ 0 $ 0
Minimum [Member]    
Property, Plant and Equipment, Useful Life 3 years  
Maximum [Member]    
Property, Plant and Equipment, Useful Life 40 years