Note 1 - Summary of Significant Interim Accounting Policies (Detail) - Significant Assumptions to Determine Fair Value of Share-Based Compensation Awards (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Stock Appreciation Rights (SARs) [Member]
Exercise price
Exercise Price (in Dollars per share)	$ 11.29		$ 13.15
Market price
Market Price (in Dollars per share)	$ 11.29		$ 13.15
Risk free interest rate (1)
Risk Free Interest Rate	0.90%	[1]	0.80%	[1]
Expected award life (years) (2)	5 years	[2]
Expected volatility (3)
Expected Volatility	46.00%	[3]	45.10%	[3]
Expected dividend yield (4)
Expected Dividend Yield	4.80%	[4]	4.10%	[4]
Stock Options [Member]
Exercise price
Exercise Price (in Dollars per share)	$ 11.29		$ 13.15
Market price
Market Price (in Dollars per share)	$ 11.29		$ 13.15
Risk free interest rate (1)
Risk Free Interest Rate	0.90%	[1]	0.80%	[1]
Expected award life (years) (2)	5 years	[2]
Expected volatility (3)
Expected Volatility	46.00%	[3]	45.10%	[3]
Expected dividend yield (4)
Expected Dividend Yield	4.80%	[4]	4.10%	[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-month periods ending March 31, was based on historical Superior common stock prices 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.