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Note 14 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]          
Open Tax Year     2012    
Foreign Tax Authority [Member] | Ministry of Economic Affairs and Finance, Italy [Member] | Earliest Tax Year [Member]          
Open Tax Year     2010    
Income Tax Expense (Benefit) $ 4,903,000 $ 4,634,000 $ 8,789,000 $ 6,646,000  
Effective Income Tax Rate Reconciliation, Percent 36.30% 37.00% 36.20% 37.00%  
Deferred Tax Assets, Valuation Allowance $ 0   $ 0   $ 0