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Consolidated Balance Sheets (Parentheticals) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred Finance Charges, Accumulated Amortization (in Dollars) $ 2,868,432us-gaap_AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts $ 2,212,091us-gaap_AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts
Common Stock, Par Value (in Dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Shares Authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Shares Issued 44,285,108us-gaap_CommonStockSharesIssued 32,679,642us-gaap_CommonStockSharesIssued
Common Stock, Shares Outstanding 42,889,773us-gaap_CommonStockSharesOutstanding 32,127,329us-gaap_CommonStockSharesOutstanding
Preferred Shares Authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Shares Outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Preferred Shares Par Value (in Dollars per share) $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Treasury stock, shares 1,395,335us-gaap_TreasuryStockShares 552,313us-gaap_TreasuryStockShares
Treasury stock, par value (in Dollars per share) $ 0.01gass_TreasuryStockParValue $ 0.01gass_TreasuryStockParValue