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F - INTANGIBLE ASSETS (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Amortization expense $ 10,000us-gaap_AmortizationOfIntangibleAssets $ 10,000us-gaap_AmortizationOfIntangibleAssets
Website, content and non-compete    
Gross Carrying Amount 1,850,000us-gaap_IntangibleAssetsGrossExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= SIEB_WebsiteMember
4,488,000us-gaap_IntangibleAssetsGrossExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= SIEB_WebsiteMember
Accumulated Amortization 1,850,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= SIEB_WebsiteMember
4,480,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= SIEB_WebsiteMember
Retail brokerage accounts    
Gross Carrying Amount 2,638,000us-gaap_IntangibleAssetsGrossExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= SIEB_RetailBrokerageAccountsMember
2,638,000us-gaap_IntangibleAssetsGrossExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= SIEB_RetailBrokerageAccountsMember
Accumulated Amortization 2,630,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= SIEB_RetailBrokerageAccountsMember
2,620,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= SIEB_RetailBrokerageAccountsMember
Amortizable assets    
Gross Carrying Amount   4,480,000us-gaap_IntangibleAssetsGrossExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= SIEB_AmortizableAssetsMember
Accumulated Amortization   4,470,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= SIEB_AmortizableAssetsMember
Intellectual property    
Gross Carrying Amount 1,850,000us-gaap_IntangibleAssetsGrossExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IntellectualPropertyMember
 
Accumulated Amortization $ 1,850,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IntellectualPropertyMember