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Note 5 - Advances for Vessels Under Construction and Acquisitions - Summary of Advances for Vessels Under Construction and Acquisitions (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Balance | $ 55,785,801 | $ 44,031,882 |
Advances for vessels under construction and acquisitions | 57,805,820 | 51,949,154 |
Interest Costs Capitalized | 813,423 | 1,660,802 | $ 1,822,443
Capitalized expenses | 2,475,138 | 2,576,626 |
Vessels delivered | (55,302,364) | (44,432,663) |
Balance | $ 61,577,818 | $ 55,785,801 | $ 44,031,882

X
- Definition Amount of increase in advances for vessels under construction and acquisitions. + References No definition available. + Details
Name: | gass_AdvancesDuringPeriod
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Advance payments to ship-builders for vessels under construction or payments to sellers for new vessels. + References No definition available. + Details
Name: | gass_AdvancesForVesselsUnderConstructionAndAcquisitions
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Other capitalized costs incurred during the construction period and before a vessel is acquired. + References No definition available. + Details
Name: | gass_CapitalizedExpenses
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition the book value including capitalized expenses of vessels that were delivered to the Company during the period. + References No definition available. + Details
Name: | gass_VesselsDelivered
Namespace Prefix: | gass_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of interest capitalized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
Name: | us-gaap_InterestCostsCapitalized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration