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Note 21 - Subsequent Events (Details Textual) - Subsequent Event [Member] - USD ($)	Aug. 03, 2017	Jul. 21, 2017	Jul. 03, 2017	Aug. 01, 2017
Payments for Loans	$ 1,000,000	$ 8,000,000
Unspecified Bank [Member] | Nerida Shipping Company [Member]
Debt Agreement, Maximum Borrowing Capacity				$ 17,625
Common Stock [Member]
Dividends Payable, Date to be Paid			Aug. 07, 2017
Dividends Payable, Date of Record			Jul. 24, 2017
Dividends Payable, Amount Per Share			$ 0.10
Series D Preferred Stock [Member]
Dividends Payable, Date to be Paid			Jul. 17, 2017
Dividends Payable, Date of Record			Jul. 14, 2017
Dividends Payable, Date Declared			Jul. 03, 2017
Dividends Payable, Amount Per Share			$ 0.546875
Series C Preferred Stock [Member]
Dividends Payable, Date to be Paid			Jul. 17, 2017
Dividends Payable, Date of Record			Jul. 14, 2017
Dividends Payable, Date Declared			Jul. 03, 2017
Dividends Payable, Amount Per Share			$ 0.53125
Series B Preferred Stock [Member]
Dividends Payable, Date to be Paid			Jul. 17, 2017
Dividends Payable, Date of Record			Jul. 14, 2017
Dividends Payable, Date Declared			Jul. 03, 2017
Dividends Payable, Amount Per Share			$ 0.476563

X

- Definition

Maximum borrowing capacity under a debt agreement on the amount that could be borrowed with a combination of, but not limited to, a line of credit and term loan.

+ References

No definition available.

+ Details

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X

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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X

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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X

- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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X

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

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X

- Definition

Cash payments for and related to principal collection on loans related to operating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

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