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Note 13 - Employee Benefit Plans - Stock Compensation Plans (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Options Outstanding Number of Shares, Balance (in shares) 485,000 120,000 185,000
Stock Options Outstanding Weighted Average Exercise Price, Balance (in dollars per share) $ 40.62 $ 27.72 $ 27.04
Stock Options Outstanding Weighted Average Exercise Price, Granted (in dollars per share) $ 47.02 $ 44.69
Stock Options Outstanding Number of Shares, Stock Options Exercised (in shares) (63,712) (71,368) (64,720)
Stock Options Outstanding Weighted Average Exercise Price, Stock Options Exercised (in dollars per share) $ 30.28 $ 22.57 $ 25.86
Stock Options Outstanding Weighted Average Exercise Price, Forfeited/Expired (in dollars per share) $ 35.05 $ 24.49
Stock Options Outstanding Number of Shares, Balance (in shares) 473,000 485,000 120,000
Stock Options Outstanding Weighted Average Exercise Price, Balance (in dollars per share) $ 42.85 $ 40.62 $ 27.72
Stock Options Outstanding Number of Shares, Granted (in shares) 58,000 375,000 0
Stock Options Outstanding Number of Shares, Stock Options Exercised (in shares) (63,712) (71,368) (64,720)
Stock Options Outstanding Number of Shares, Stock Options from Acquisitions (in shares)   66,000  
Stock Options Outstanding Weighted Average Exercise Price, Stock Options from Acquisitions (in dollars per share)   $ 20.43  
Stock Options Outstanding Number of Shares, Forfeited/Expired (in shares) (6,000) (5,000)  
Stock Options Outstanding Weighted Average Exercise Price, Stock Options Exercised (in dollars per share) $ 30.28 $ 22.57 $ 25.86
Stock Options Outstanding Number of Shares, Exercisable (in shares) 322,000    
Stock Options Outstanding Weighted Average Exercise Price,Exercisable (in dollars per share) $ 41.82    
Restricted Stock [Member]      
Stock Awards/Units Outstanding Number of Shares, Balance (in shares) 171,000 227,000 145,000
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Balance (in dollars per share) $ 35.65 $ 31.88 $ 26
Stock Awards/Units Outstanding Number of Shares, Granted (in shares) 136,000 95,000 134,000
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Granted (in dollars per share) $ 46.92 $ 43.45 $ 37.51
Stock Awards/Units Outstanding Number of Shares, Vested (in shares) (159,000) (131,000) (51,000)
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Vested (in dollars per share) $ 41.91 $ 34.77 $ 30.62
Stock Awards/Units Outstanding Number of Shares, Forfeited/Expired (in shares) (9,000) (20,000) (1,000)
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Forfeited/Expired (in dollars per share) $ 43.70 $ 35.36 $ 26.54
Stock Awards/Units Outstanding Number of Shares, Balance (in shares) 139,000 171,000 227,000
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Balance (in dollars per share) $ 40.96 $ 35.65 $ 31.88
Stock Units [Member]      
Stock Awards/Units Outstanding Number of Shares, Balance (in shares) 20,000
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Balance (in dollars per share) $ 37.15
Stock Awards/Units Outstanding Number of Shares, Granted (in shares) 108,000 20,000
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Granted (in dollars per share) $ 46.95 $ 37.15
Stock Awards/Units Outstanding Number of Shares, Vested (in shares) (12,000)
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Vested (in dollars per share) $ 45.54
Stock Awards/Units Outstanding Number of Shares, Forfeited/Expired (in shares) (3,000)
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Forfeited/Expired (in dollars per share) $ 47.02
Stock Awards/Units Outstanding Number of Shares, Balance (in shares) 113,000 20,000
Stock Awards/Units Outstanding Weighted Average Grant-Date Fair-Value, Balance (in dollars per share) $ 45.40 $ 37.15