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3. Fair Value of Financial Instruments (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Securities $ 518,000us-gaap_FinancialInstrumentsOwnedAtFairValue $ 488,000us-gaap_FinancialInstrumentsOwnedAtFairValue
Level 1 [Member]    
Cash equivalents 6,746,000us-gaap_CashEquivalentsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Securities 518,000us-gaap_FinancialInstrumentsOwnedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Financial instruments valued at fair value $ 7,264,000SIEB_FinancialInstrumentsValuedAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member