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Note 1 - Basis of Presentation and General Information (Detail) - Charterers Percentage of Revenue | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Charterer A [Member] |  |  |
Charterer |  |  | 10.00%
Charterer B [Member] |  |  |
Charterer | 12.00% | 14.00% | 12.00%
Charterer C [Member] |  |  |
Charterer |  |  | 11.00%
Charterer D [Member] |  |  |
Charterer |  |  | 10.00%

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