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Note 13 - Income Taxes (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Deferred Tax Assets, Valuation Allowance $ 0   $ 0  
Effective Income Tax Rate Reconciliation, Percent 38.50% 37.70% 39.50% 38.60%
Deferred Tax Assets, Net of Valuation Allowance $ 34,800,000   $ 34,800,000  
Deferred Tax Liabilities, Gross $ 23,300,000   $ 23,300,000