Note 9 - Dividends Payable (Details Textual)	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Apr. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Preferred Stock Dividends, Income Statement Impact	$ 35,000	$ 35,000
Dividends Payable, Current	338,000			$ 303,000
Series 1 [Member]
Preferred Stock Dividends, Income Statement Impact	$ 12,000
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%
Number of Outside Board Members Holding Interest In Preferred Stock	1
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