Note 10 - Dividends Payable (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Nov. 01, 2017	Sep. 30, 2016
Dividends Payable	$ 104,000	$ 104,000		$ 104,000
Preferred Stock [Member]
Dividends Payable	411,000	$ 411,000
Series 1 Preferred Stock [Member]
Dividends, Preferred Stock	$ 14,000
Preferred Stock, Dividend Rate, Percentage	5.00%
Series 2 Preferred Stock [Member]
Dividends, Preferred Stock	$ 15,000
Preferred Stock, Dividend Rate, Percentage	5.00%
Series 3 Preferred Stock [Member]
Dividends, Preferred Stock	$ 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