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Note 9 - Income Taxes (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 34.00%    
Unrecognized Tax Benefits $ 117,000 $ 117,000 $ 117,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 0 $ 0