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Note 12 - Common Stock and Additional Paid-in Capital (Details) (USD $) | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 26, 2014 | Aug. 12, 2014 | May 07, 2014 | Feb. 14, 2014 | Aug. 02, 2007 | Apr. 30, 2013 | Jul. 18, 2007 | Aug. 07, 2006 | Oct. 05, 2005 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 22, 2010
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  | 100,000,000 us-gaap_CommonStockSharesAuthorized | 100,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 3,500,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 4,476,195 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 3,398,558 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 460,105 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  | 400,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 8,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |
Common Stock, Shares, Outstanding |  |  |  |  |  |  |  |  | 14,000,000 us-gaap_CommonStockSharesOutstanding | 42,889,773 us-gaap_CommonStockSharesOutstanding | 32,127,329 us-gaap_CommonStockSharesOutstanding |  |  |  |
Sale of Stock, Price Per Share (in Dollars per share) |  | $ 10.00 us-gaap_SaleOfStockPricePerShare | $ 10.50 us-gaap_SaleOfStockPricePerShare | $ 9.71 us-gaap_SaleOfStockPricePerShare |  | $ 10.00 us-gaap_SaleOfStockPricePerShare | $ 18.00 us-gaap_SaleOfStockPricePerShare | $ 12.54 us-gaap_SaleOfStockPricePerShare |  |  |  |  |  |  |
Shares Public Offering |  |  |  |  |  | 11,500,000 gass_SharesPublicOffering | 7,200,000 gass_SharesPublicOffering |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in Dollars per share) |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |
Proceeds from Issuance of Common Stock (in Dollars) |  |  |  |  | $ 8,281,890 us-gaap_ProceedsFromIssuanceOfCommonStock |  | $ 129,600,000 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  | $ 112,302,678 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 109,119,029 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |
Proceeds From Issuance of Equity, Net of Issuance Costs (in Dollars) |  | 34,071,501 gass_ProceedsFromIssuanceOfEquityNetOfIssuanceCosts | 46,294,133 gass_ProceedsFromIssuanceOfEquityNetOfIssuanceCosts | 31,937,044 gass_ProceedsFromIssuanceOfEquityNetOfIssuanceCosts | 7,826,386 gass_ProceedsFromIssuanceOfEquityNetOfIssuanceCosts | 109,119,029 gass_ProceedsFromIssuanceOfEquityNetOfIssuanceCosts | 121,932,958 gass_ProceedsFromIssuanceOfEquityNetOfIssuanceCosts |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  | 1,080,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount (in Dollars) | 10,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock Repurchased During Period, Shares | 843,022 us-gaap_StockRepurchasedDuringPeriodShares |  |  |  |  |  |  |  |  |  | 0 us-gaap_StockRepurchasedDuringPeriodShares | 0 us-gaap_StockRepurchasedDuringPeriodShares | 551,646 us-gaap_StockRepurchasedDuringPeriodShares | 1,205,229 us-gaap_StockRepurchasedDuringPeriodShares |
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) | $ 6.29 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |  |  |  |  |  |  |  |  |  | $ 4.05 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 5.21 us-gaap_TreasuryStockAcquiredAverageCostPerShare |
Proceeds from Issuance or Sale of Equity (in Dollars) |  | $ 35,000,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity | $ 47,000,047 us-gaap_ProceedsFromIssuanceOrSaleOfEquity | $ 32,999,998 us-gaap_ProceedsFromIssuanceOrSaleOfEquity |  | $ 115,000,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity |  |  |  |  |  |  |  |  |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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