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Note 10 - Segment Information (Details) - Long Lived Assets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Note 10 - Segment Information (Details) - Long Lived Assets [Line Items]    
Long lived assets $ 12,402us-gaap_NoncurrentAssets $ 12,611us-gaap_NoncurrentAssets
UNITED STATES    
Note 10 - Segment Information (Details) - Long Lived Assets [Line Items]    
Long lived assets 9,530us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US		 9,368us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US
International [Member]    
Note 10 - Segment Information (Details) - Long Lived Assets [Line Items]    
Long lived assets $ 2,872us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= sgrp_InternationalMember		 $ 3,243us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= sgrp_InternationalMember