Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2016	Dec. 31, 2015
Series C Preferred Stock [Member]
Redeemable series C preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Redeemable series C preferred stock, authorized (in shares)	150,000	150,000
Redeemable series C preferred stock, issued (in shares)	0	5,000
Redeemable series C preferred stock, outstanding (in shares)	0	5,000
Series B Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	1,200,000	1,200,000
Preferred stock, issued (in shares)	44,345	1,102,433
Preferred stock, outstanding (in shares)	44,345	1,102,433
Convertible Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	2,000,000	2,000,000
Preferred stock, issued (in shares)	0	255,000
Preferred stock, outstanding (in shares)	0	255,000
Series D Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	690,000	690,000
Preferred stock, issued (in shares)	46,092	690,000
Preferred stock, outstanding (in shares)	46,092	690,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	60,000,000	60,000,000
Common stock, issued (in shares)	35,183,125	32,025,753
Common stock, outstanding (in shares)	35,183,125	32,025,753