Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	6,213	0
Preferred stock, shares outstanding (in shares)	6,213	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	120,000,000	60,000,000
Common stock, shares issued (in shares)	10,569,452	8,725,069
Common stock, shares outstanding (in shares)	10,567,960	8,723,577
Treasury stock, shares (in shares)	1,492	1,492