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Note 20 - Sale of Leaseback of Vessels (Details Textual) - USD ($)		2 Months Ended	12 Months Ended
	Dec. 16, 2016	Dec. 31, 2014	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sale Leaseback Transaction, Term of Lease	5 years 91 days	4 years
Gas Premiership and Gas Cathar [Member]
Sale Leaseback Transaction, Deferred Gain, Gross		$ 780,695
Sale Leaseback Transaction, Current Period Gain Recognized			$ 195,040	$ 195,574	$ 195,040
Gas Premiership and Gas Cathar [Member] | Charter Hire Expenses [Member]
Sale Leaseback Transaction, Rent Expense			3,719,810	$ 4,249,961	$ 4,320,000
Minimum Lease Payments, Sale Leaseback Transactions, Next Twelve Months			3,540,000
Minimum Lease Payments, Sale Leaseback Transactions, within Two Years			1,560,000
Minimum Lease Payments, Sale Leaseback Transactions, within Three Years			$ 390,000

X

- Definition

Represents the term of the lease under a sale leaseback transaction.

+ References

No definition available.

+ Details

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X

- Definition

Amount of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77914019&loc=d3e50824-112756

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X

- Definition

Amount of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=77914019&loc=d3e50824-112756

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X

- Definition

Amount of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 50
-Paragraph 2
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X

- Definition

The portion of the deferred gain that was recognized in the current period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 35
-Paragraph 1
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- Definition

The amount of the gain recorded in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller to be recognized in future periods.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 25
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=77913853&loc=d3e49567-112750

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- Definition

The amount of the current period expense recorded for use of the property in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

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