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Note 8 - Geographic Information - Property and Equipment by Geographic Area (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property and Equipment, net:    
Property and equipment, net $ 100,272us-gaap_PropertyPlantAndEquipmentNet $ 96,509us-gaap_PropertyPlantAndEquipmentNet
UNITED STATES    
Property and Equipment, net:    
Property and equipment, net 78,031us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US		 74,781us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
UNITED KINGDOM    
Property and Equipment, net:    
Property and equipment, net 7,092us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_GB		 6,088us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_GB
Not Connected to a Country [Member]    
Property and Equipment, net:    
Property and equipment, net 2,176us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= stnr_NotConnectedToACountryMember		 2,231us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= stnr_NotConnectedToACountryMember
Other Countries [Member]    
Property and Equipment, net:    
Property and equipment, net $ 12,973us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= stnr_OtherCountriesMember		 $ 13,409us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= stnr_OtherCountriesMember