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Note 18 - Subsequent Events (Detail) (Purchase of Five Vessels [Member], Subsequent Event [Member], USD $)	Mar. 31, 2013
Purchase of Five Vessels [Member] | Subsequent Event [Member]
Contractual Obligation	$ 93,700,000

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant