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Note 15 - Voyage Expenses and Vessel Operating Expenses (Details) - Voyage Expenses (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 15 - Voyage Expenses and Vessel Operating Expenses (Details) - Voyage Expenses [Line Items]      
Voyage expenses $ 14,087,511gass_VoyageExpensesIncludingRelatedParty $ 14,302,630gass_VoyageExpensesIncludingRelatedParty $ 12,703,750gass_VoyageExpensesIncludingRelatedParty
Port Expenses [Member]      
Note 15 - Voyage Expenses and Vessel Operating Expenses (Details) - Voyage Expenses [Line Items]      
Voyage expenses 2,278,961gass_VoyageExpensesIncludingRelatedParty
/ gass_VoyageExpensesAxis
= gass_PortExpensesMember		 2,067,494gass_VoyageExpensesIncludingRelatedParty
/ gass_VoyageExpensesAxis
= gass_PortExpensesMember		 1,749,565gass_VoyageExpensesIncludingRelatedParty
/ gass_VoyageExpensesAxis
= gass_PortExpensesMember
Bunkers [Member]      
Note 15 - Voyage Expenses and Vessel Operating Expenses (Details) - Voyage Expenses [Line Items]      
Voyage expenses 7,553,318gass_VoyageExpensesIncludingRelatedParty
/ gass_VoyageExpensesAxis
= gass_BunkersMember		 8,347,130gass_VoyageExpensesIncludingRelatedParty
/ gass_VoyageExpensesAxis
= gass_BunkersMember		 7,253,583gass_VoyageExpensesIncludingRelatedParty
/ gass_VoyageExpensesAxis
= gass_BunkersMember
Commissions [Member]      
Note 15 - Voyage Expenses and Vessel Operating Expenses (Details) - Voyage Expenses [Line Items]      
Voyage expenses 3,725,645gass_VoyageExpensesIncludingRelatedParty
/ gass_VoyageExpensesAxis
= gass_CommissionsMember		 3,244,939gass_VoyageExpensesIncludingRelatedParty
/ gass_VoyageExpensesAxis
= gass_CommissionsMember		 3,304,220gass_VoyageExpensesIncludingRelatedParty
/ gass_VoyageExpensesAxis
= gass_CommissionsMember
Other Voyage Expenses [Member]      
Note 15 - Voyage Expenses and Vessel Operating Expenses (Details) - Voyage Expenses [Line Items]      
Voyage expenses $ 529,587gass_VoyageExpensesIncludingRelatedParty
/ gass_VoyageExpensesAxis
= gass_OtherVoyageExpensesMember		 $ 643,067gass_VoyageExpensesIncludingRelatedParty
/ gass_VoyageExpensesAxis
= gass_OtherVoyageExpensesMember		 $ 396,382gass_VoyageExpensesIncludingRelatedParty
/ gass_VoyageExpensesAxis
= gass_OtherVoyageExpensesMember