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Note 5 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Customer Relationships [Member]    
Amortized Intangible Assets    
Amortized Intangible Assets, Useful Life Range 4 years 4 years
Amortized Intangible Assets, Gross Carrying Amount $ 6,526 $ 6,526
Amortized Intangible Assets, Accumulated Amortization $ 6,526 $ 6,526
Use Rights [Member] | Minimum [Member]    
Amortized Intangible Assets    
Amortized Intangible Assets, Useful Life Range 1 year 1 year
Use Rights [Member] | Maximum [Member]    
Amortized Intangible Assets    
Amortized Intangible Assets, Useful Life Range 25 years 25 years
Use Rights [Member]    
Amortized Intangible Assets    
Amortized Intangible Assets, Gross Carrying Amount $ 4,107 $ 4,107
Amortized Intangible Assets, Accumulated Amortization 3,597 3,536
Amortized Intangible Assets, Net Carrying Amount 510 571
Franchise Rights [Member]    
Indefinite-Lived Intangible Assets    
Indefinite-Lived Intangible Assets, Gross Carrying Amount 496,321 496,321
Amortized Intangible Assets, Gross Carrying Amount 10,633 10,633
Amortized Intangible Assets, Accumulated Amortization 10,123 10,062
Amortized Intangible Assets, Net Carrying Amount $ 510 $ 571