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Note 5 - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Minimum [Member] | Use Rights [Member]    
Useful Life 1 year 1 year
Maximum [Member] | Use Rights [Member]    
Useful Life 25 years 25 years
Use Rights [Member]    
Gross Carrying Amount $ 4,132 $ 4,127
Accumulated Amortization 3,709 3,678
Net Carrying Amount 423 449
Franchise Rights [Member]    
Gross Carrying Amount $ 496,321 $ 496,321