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Note 9 - Dividends Payable (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Aug. 01, 2017	Dec. 31, 2016
Preferred Stock Dividends, Income Statement Impact	$ 35,000	$ 35,000	$ 69,000	$ 69,000
Dividends Payable, Current	374,000		$ 374,000			$ 303,000
Series 1 [Member]
Preferred Stock Dividends, Income Statement Impact	$ 13,000
Preferred Stock, Dividend Rate, Percentage	5.00%
Series 2 [Member]
Preferred Stock Dividends, Income Statement Impact	$ 15,000
Preferred Stock, Dividend Rate, Percentage	5.00%
Series 3 [Member]
Preferred Stock Dividends, Income Statement Impact	$ 8,000
Preferred Stock, Dividend Rate, Percentage	5.00%
Series 2 Preferred Stock and Series 3 Preferred Stock [Member]
Preferred Stock Unpaid Dividends Additional Late Fee Penalty Percentage			18.00%
Period From Issuance of Written Notice For Failure to Pay Dividend Within Which Entity Must Cure Breach			45 days
Series 2 Preferred Stock and Series 3 Preferred Stock [Member] | Subsequent Event [Member]
Preferred Stock, Redemption Amount					$ 2,200,000

X

- Definition

Represents the period from the issuance of written notice for failure to pay dividend within which the entity must cure the breach.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of additional late fee penalty the entity will be required to pay on unpaid dividends for the preferred stock.

+ References

No definition available.

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- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

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- Definition

The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.

+ References

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- Definition

The redemption (or callable) amount of currently redeemable preferred stock. Includes amounts representing dividends not currently declared or paid but which will be payable under the redemption features or for which ultimate payment is solely within the control of the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.27(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21564-112644

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