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Note 17 - Taxes	6 Months Ended
	Jun. 30, 2017
Notes to Financial Statements
Income Tax Disclosure [Text Block]	17. Taxes: Under the laws of the countries of incorporation for the vessel-owning companies and/or of the countries of registration of the vessels, the companies are not subject to tax on international shipping income; however, they are subject to registration and tonnage taxes, which are included in Vessel operating expenses in the accompanying consolidated statements of income. The vessel-owning companies with vessels that have called on the United States during the relevant year of operation are obliged to file tax returns with the Internal Revenue Service. The applicable tax is 50% of 4% of U.S.-related gross transportation income unless an exemption applies. Management believes that, based on current legislation the relevant vessel-owning companies are entitled to an exemption under Section 883 of the Internal Revenue Code of 1986, as amended.

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The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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