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Note 8 - Income Taxes (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]        
Open Tax Year     2013  
Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]        
Open Tax Year     2015  
State and Foreign Jurisdictions [Member] | Earliest Tax Year [Member]        
Open Tax Year     2012  
State and Foreign Jurisdictions [Member] | Latest Tax Year [Member]        
Open Tax Year     2015  
Effective Income Tax Rate Reconciliation, Percent 39.20% 37.70% 38.50% 39.10%
Unrecognized Tax Benefits $ 1.2   $ 1.2  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 1.0   1.0  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 0.4   $ 0.4