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Shareholders' Equity (Details) (USD $)
1 Months Ended 3 Months Ended
Jan. 31, 2015
Dec. 31, 2013
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 26, 2013
Nov. 23, 2010
Class of Stock [Line Items]              
Common stock, par value     $ 0.001us-gaap_CommonStockParOrStatedValuePerShare   $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Total number of common stock shares to be registered with SEC under Form S-1   1,840,000smtp_CommonStockRegisteredUnderFormSone          
Proceeds from issuance of common stock   $ 11,500,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 3,438us-gaap_ProceedsFromIssuanceOfCommonStock $ 10,507,427us-gaap_ProceedsFromIssuanceOfCommonStock      
Cash dividends paid        $ 601,766us-gaap_PaymentsOfDividendsCommonStock      
Restricted common stock issued 5,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures            
Warrant [Member]              
Class of Stock [Line Items]              
Warrants cancelled 30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirations
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
  30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirations
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember