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Note 2 - Other Assets (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Other Assets, Noncurrent $ 47,840,000   $ 48,510,000
Depreciation, Depletion and Amortization 21,683,000 16,641,000  
Franchise Rights [Member]
     
Other Assets, Noncurrent 4,500,000    
Sales Revenue, Services, Net [Member]
     
Concentration Risk, Percentage 38.00%    
Computer Software, Intangible Asset [Member]
     
Other Assets, Noncurrent 40,600,000    
Finite-Lived Intangible Assets, Accumulated Amortization 4,800,000    
Finite-Lived Intangible Asset, Useful Life 15 years    
Depreciation, Depletion and Amortization $ 700,000 $ 500,000