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Note 12 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earliest Tax Year [Member]        
Open Tax Year     2012  
Income Tax Expense (Benefit) $ 4,571,000 $ 5,744,000 $ 20,969,000 $ 21,638,000
Effective Income Tax Rate Reconciliation, Percent 29.10% 31.40% 36.40% 36.20%
Effective Income Tax Rate Reconciliation, Benefit Resulting from Expiration of Applicable Statute Limitations, Amount $ 1,306,000 $ 1,715,000 $ 1,306,000 $ 1,715,000
Effective Income Tax Rate Reconciliation, Benefit Resulting from Expiration of Applicable Statute Limitations, Percent 8.30% 9.40% 2.30% 2.90%