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Note 4 - Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Franchise Rights [Member]    
Gross Carrying Amount, Indefinite-lived Intangible Assets $ 497,136 $ 497,136
Use Rights [Member]    
Gross Carrying Amount 4,141 4,138
Accumulated Amortization 3,817 3,794
Net Carrying Amount $ 324 $ 344
Minimum [Member] | Use Rights [Member]    
Useful Life (Year) 1 year 1 year
Maximum [Member] | Use Rights [Member]    
Useful Life (Year) 25 years 25 years