Note 7 - Convertible Preferred Stock, Net (Details Textual) - USD ($)						3 Months Ended		9 Months Ended
	Oct. 01, 2015	Sep. 16, 2015	Jul. 02, 2015	Apr. 01, 2015	Feb. 11, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 12, 2015	Feb. 05, 2015	Dec. 31, 2014
Non-Standby Purchasers [Member] | Convertible Preferred Stock [Member]
Temporary Equity, Shares Issued											130,884
The Standby Purchasers [Member] | Convertible Preferred Stock [Member]
Rights Offering, Right to Purchase Preferred Stock, Price Per Share										$ 105	$ 100
Temporary Equity, Shares Issued										150,000	524,116
Convertible Preferred Stock [Member] | Cash Dividends [Member]
Preferred Stock, Dividend Rate, Percentage					5.50%
Convertible Preferred Stock [Member] | Paid-in-kind Dividends [Member]
Preferred Stock, Dividend Rate, Percentage					8.50%
Convertible Preferred Stock [Member] | Subsequent Event [Member]
Dividends, Preferred Stock	$ 1,116,000
Convertible Preferred Stock [Member]
Temporary Equity, Shares Issued						805,000		805,000				0
Dividends, Preferred Stock			$ 1,104,000	$ 594,000
Cash Dividends [Member]
Preferred Stock, Dividend Rate, Percentage								5.50%
Paid-in-kind Dividends [Member]
Preferred Stock, Dividend Rate, Percentage								8.50%
Common Stock [Member]
Convertible Preferred Stock Converted to Other Securities		$ 2.51
Dividends, Preferred Stock
Convertible Preferred Stock, Pro Rata Share					$ 65,500,000						$ 65,500,000
Rights Offering, Right to Purchase Preferred Stock, Price Per Share					$ 100						$ 100
Conversion Price											$ 39.88
Registered Rights Offering, Convertible Preferred Stock, Value											$ 65,500,000
Dividends, Preferred Stock						$ 1,116,000		$ 2,814,000