XML 151 R97.htm IDEA: XBRL DOCUMENT v3.5.0.2

Transactions with Related Parties, Brokerage Agreement - 20F (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Brokerage Agreement [Abstract]
Voyage expenses related parties	$ 0	$ 24	$ 313
Safbulk Brokerage Agreement [Member]
Brokerage Agreement [Abstract]
Brokerage commission	1.25%
Voyage expenses related parties	$ 0	$ 24	$ 313

X

- References

No definition available.

+ Details

Name:	ship_BrokerageAgreementAbstract
Namespace Prefix:	ship_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Brokerage commission on hire.

+ References

No definition available.

+ Details

Name:	ship_BrokerageCommissionPercentage
Namespace Prefix:	ship_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expenses with related parties primarily consisting of commissions and fees, which are expenses for by the company, regardless of the charter type.

+ References

No definition available.

+ Details

Name:	ship_VoyageExpensesRelatedParties
Namespace Prefix:	ship_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ship_SafbulkBrokerageAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: