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Note 1 - Significant Assumptions for Share-based Compensation Awards (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Stock Appreciation Rights (SARs) [Member]        
2015 (in dollars per share)        
2015 (in dollars per share)        
2015 [1]        
Expected award life (years) (2) [2]        
2015 [3]        
2015 [4]        
Employee Stock Option [Member] | Minimum [Member]        
2015 (in dollars per share) $ 16.78 $ 7.36 $ 16.78 $ 7.36
2015 (in dollars per share)     $ 16.78 $ 7.36
2015 [1]     1.50% 1.50%
Expected award life (years) (2) [2]     5 years  
2015 [3]     34.90% 37.30%
2015 [4]     1.60% 3.40%
Employee Stock Option [Member] | Maximum [Member]        
2015 (in dollars per share) 18.66 7.96 $ 18.66 $ 7.96
2015 (in dollars per share)     $ 18.66 $ 7.96
2015 [1]     2.10% 2.60%
Expected award life (years) (2) [2]     10 years  
2015 [3]     39.00% 42.50%
2015 [4]     1.80% 3.70%
Employee Stock Option [Member]        
2015 (in dollars per share) 16.78 7.96 $ 16.78 $ 7.96
2015 (in dollars per share) $ 16.78 $ 7.96    
2015 [1] 2.10% 2.60%    
Expected award life (years) (2) [2] 10 years      
2015 [3] 39.00% 37.30%    
2015 [4] 1.80% 3.40%    
[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 six-month periods ending June 30, 2015 and 2014 was based on historical prices of Superior’s common stock 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.