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Note 6 - Vessels, Net and Vessels Held for Sale (Detail) (USD $)
 1 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Gas Elixir, Gas Cerberus, and Gas Myth [Member]
Dec. 31, 2011
Gas Shanghai, Gas Chios, Gas Czar, and Gas Nemesis [Member]
Dec. 31, 2011
Vessels [Member]
Dec. 23, 2011
Gas Tiny [Member]
Dec. 31, 2011
Gas Tiny [Member]
Dec. 16, 2011
Gas Tiny [Member]
Dec. 31, 2012
Gas Husky and Gas Esco [Member]
Dec. 31, 2012
Gas Kalogeros [Member]
Dec. 31, 2012
Gas Tiny and Gas Kalogeros [Member]
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds   $ 69,906,578 $ 25,850,000       $ 2,400,000 $ 65,661,599 $ 16,800,000  
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax       5,654,178           1,372,409
Assets Held-for-sale, Current 921,285         921,285        
Percentage of Selling Price Received As Deposit         10.00%          
Amount of Selling Price Received as Deposit         $ 240,000