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Note 9 - Deferred Income	12 Months Ended
	Dec. 31, 2017
Notes to Financial Statements
Deferred Revenue Disclosure [Text Block]	9. Deferred Income The amounts shown in the accompanying consolidated balance sheets amounting to $4,856,122 and $4,366,091 represent cash related to time and bareboat charter revenues received in advance as of December  31, 2016 and as of December  31, 2017, respectively.

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- Definition

The entire disclosure for deferred revenues at the end of the reporting period, and description and amounts of significant changes that occurred during the reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 430
-URI http://asc.fasb.org/topic&trid=2122452

+ Details

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- References

No definition available.

+ Details

Name:	us-gaap_DisclosureTextBlockAbstract
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Data Type:	xbrli:stringItemType
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