Consolidated Balance Sheets (Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Series B Preferred Stock [Member]
Preferred stock, per share liquidation preference (in dollars per share)	$ 1,000	$ 1,000	$ 1,000
Preferred stock, shares issued (in shares)	0	0	56,600
Preferred stock, shares outstanding (in shares)	0	0	56,600
Series C Preferred Stock [Member]
Preferred stock, per share liquidation preference (in dollars per share)	$ 1,000	$ 1,000	$ 1,000
Preferred stock, shares issued (in shares)	0	0	15,300
Preferred stock, shares outstanding (in shares)	0	0	15,300
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000	1,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000	100,000,000
Common stock, shares issued (in shares)	33,581,599	33,467,893	33,303,467
Common stock, shares outstanding (in shares)	33,581,599	33,467,893	33,303,467