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Note 4 - Stock-Based Compensation (Detail) - Stock Options Activity (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Number of options   333,000 437,000 620,000 980,000
Weighted average exercise price (in Dollars per share)   $ 15.70 $ 15.67 $ 14.66 $ 13.36
Weighted average remaining contractual term   1 year 6 months 2 years 36 days 3 years 73 days 3 years 219 days
Aggregate intrinsic value (in Dollars)       $ 230  
Exercisable at December 31, 2012   333,000      
Exercisable at December 31, 2012 (in Dollars per share)   $ 15.70      
Exercisable at December 31, 2012   1 year 6 months      
Number of options exercised 163,000     (163,000)  
Weighted average exercise price, exercised (in Dollars per share)       $ 8.00  
Number of options forfeited   (104,000) (183,000) (197,000)  
Weighted average exercise price, forfeited (in Dollars per share)   $ 15.54 $ 12.27 $ 13.42