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Note 1 - Basis of Presentation and General Information (Detail) - Charterers that Individually Accounted for More Than 10% of the Company's Voyage and Time Charter Revenues	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Maersk Lines [Member]
Percentage of Revenue by Charterer	11.75%	15.73%	14.95%
Klaveness [Member]
Percentage of Revenue by Charterer	10.71%	13.59%	30.29%
Sun Express [Member]
Percentage of Revenue by Charterer			10.10%

X

- Definition

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration