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Note 4 - Goodwill and Franchise Value (Details) - Franchise Value (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Franchise Value [Abstract]    
Balance $ 150,892us-gaap_IndefiniteLivedFranchiseRights $ 71,199us-gaap_IndefiniteLivedFranchiseRights
Additions through acquisitions   80,233us-gaap_IndefinitelivedIntangibleAssetsAcquired
Reduction related to divestiture and transfer to assets held for sale (36)us-gaap_IndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit (540)us-gaap_IndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit
Balance $ 150,856us-gaap_IndefiniteLivedFranchiseRights $ 150,892us-gaap_IndefiniteLivedFranchiseRights