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Transactions with Related Parties, Technical Management Agreement - 20F (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) $ / Vessel | Dec. 31, 2013 USD ($) $ / Vessel
Technical Management Agreement [Abstract] |  |  |
Fixed daily fee per vessel | $ / Vessel |  | 0.45 | 0.45
Management fees | $ | $ 0 | $ 122 | $ 743

X
- Definition Daily fixed fee per vessel in USD. + References No definition available. + Details
Name: | ship_DailyManagementFeePerVessel
Namespace Prefix: | ship_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of related parties management fees. + References No definition available. + Details
Name: | ship_ManagementFeesRelatedParties
Namespace Prefix: | ship_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | ship_TechnicalManagementAgreementAbstract
Namespace Prefix: | ship_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration