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Note 7 - Income Taxes (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]        
Open Tax Year     2012  
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     2011  
State and Foreign Jurisdictions [Member] | Latest Tax Year [Member]        
Open Tax Year     2015  
Effective Income Tax Rate Reconciliation, Percent 37.20% 39.10% 36.70% 39.50%
Unrecognized Tax Benefits $ 0.4   $ 0.4  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 0.3   0.3  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 0.1   $ 0.1