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Note 10 - Income Taxes (Details) - Unrecognized Tax Benefits - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Unrecognized Tax Benefits [Abstract]    
Balance, beginning of year $ 117,000 $ 117,000
Change in uncertain tax benefits 0 0
Balance, end of year $ 117,000 $ 117,000