Note 9 - Commitments and Contingencies (Details Textual) $ in Millions	Jun. 30, 2016 USD ($)
President, Cheif Executive Officer and Director [Member] \| Newbuilding Agreement for Hull S417 [Member]
Contractual Obligation	$ 23.1

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

No definition available.

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