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Note 4 - Inventories (Details) - Inventory (USD $)
Dec. 31, 2014
Dec. 31, 2013
Inventory [Abstract]    
Bunkers $ 1,426,838gass_InventoriesBunkers $ 930,630gass_InventoriesBunkers
Lubricants 1,531,828gass_InventoryLubricants 1,530,463gass_InventoryLubricants
Total $ 2,958,666us-gaap_InventoryNet $ 2,461,093us-gaap_InventoryNet