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Note 2 - Goodwill and Other Intangible Assets (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Other Assets, Noncurrent $ 49,132,000 $ 49,132,000   $ 48,789,000
Depreciation, Depletion and Amortization   34,267,000 26,108,000  
Goodwill, Purchase Accounting Adjustments 1,700,000      
Franchise Rights [Member]
        
Other Assets, Noncurrent 4,500,000 4,500,000   2,800,000
Computer Software, Intangible Asset [Member]
        
Other Assets, Noncurrent 41,700,000 41,700,000    
Finite-Lived Intangible Assets, Accumulated Amortization 2,600,000 2,600,000    
Depreciation, Depletion and Amortization 700,000 1,400,000    
Finite-Lived Intangible Asset, Useful Life   15 years    
Amortization of Intangible Assets   $ 2,800,000