Note 1 - Summary of Significant Interim Accounting Policies (Details) - Significant Assumptions for Share-based Compensation Awards (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Stock Appreciation Rights (SARs) [Member]
Exercise price
Exercise price (in Dollars per share)	$ 14.72		$ 11.29		$ 14.72		$ 11.29
Market price
Market price (in Dollars per share)					$ 14.72		$ 11.29
Risk free interest rate (1)
Risk free interest rate		[1]		[1]	1.50%	[1]	0.90%	[1]
Expected award life		[2]			5 years	[2]
Expected volatility (3)
Expected volatility		[3]		[3]	42.50%	[3]	46.00%	[3]
Expected dividend yield (4)
Expected dividend yield		[4]		[4]	3.70%	[4]	4.80%	[4]
Employee Stock Option [Member] | Minimum [Member]
Exercise price
Exercise price (in Dollars per share)	$ 14.72		$ 11.29		$ 14.72		$ 11.29
Market price
Market price (in Dollars per share)					$ 14.72		$ 11.29
Risk free interest rate (1)
Risk free interest rate					1.50%	[1]	0.90%	[1]
Expected award life					5 years	[2]
Expected volatility (3)
Expected volatility					37.30%	[3]	36.70%	[3]
Expected dividend yield (4)
Expected dividend yield					2.90%	[4]	4.60%	[4]
Employee Stock Option [Member] | Maximum [Member]
Exercise price
Exercise price (in Dollars per share)	$ 20.75		$ 11.76		$ 20.75		$ 11.76
Market price
Market price (in Dollars per share)					$ 20.75		$ 11.76
Risk free interest rate (1)
Risk free interest rate					2.60%	[1]	1.70%	[1]
Expected award life					10 years	[2]
Expected volatility (3)
Expected volatility					42.50%	[3]	46.00%	[3]
Expected dividend yield (4)
Expected dividend yield					3.70%	[4]	4.80%	[4]
Employee Stock Option [Member]
Exercise price
Exercise price (in Dollars per share)	$ 20.75		$ 11.76		$ 20.75		$ 11.76
Market price
Market price (in Dollars per share)	$ 20.75		$ 11.76
Risk free interest rate (1)
Risk free interest rate	1.80%	[1]	1.40%	[1]
Expected award life	5 years	[2]
Expected volatility (3)
Expected volatility	37.40%	[3]	45.70%	[3]
Expected dividend yield (4)
Expected dividend yield	2.90%	[4]	4.60%	[4]

[1] The risk-free interest rate is based on the yield of a U.S. treasury bond with a similar maturity as the expected life of the awards.

[2] The expected life in years for awards granted was based on the historical exercise patterns experienced by the Company when the award is made.

[3] The determination of expected stock price volatility for awards granted in each of the three and nine-month periods ending September 30, was based on historical common stock prices for the Company over a period commensurate with the expected life.

[4] The dividend yield assumption is based on the history and expectation of the Company's dividend payouts.