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Note 10 - Income Taxes (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Mar. 31, 2016
USD ($)
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Effective Income Tax Rate Reconciliation, Percent 35.00%   35.00% 35.40% 35.00%
Tax Adjustments, Settlements, and Unusual Provisions   $ 40,000      
Number of Specific Tax Jurisdictions   1