Note 9 - Common Stock (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

					Number of
					Shares
					Outstanding
	Exercisable	Expiration	Exercise		Under
Issuance Date	for	Date	Price		Warrants
October 2014	Common Shares	October 13, 2019	$	424.00		288
November 2014	Common Shares	November 12, 2019	$	424.00		125
February 2015	Common Shares	February 17, 2025	$	400.00		754
March 2015	Common Shares	March 26, 2025	$	272.00		14
May 2015	Common Shares	May 12, 2025	$	424.00		362
May 2015	Common Shares	May 17, 2020	$	424.00		215
December 2015	Common Shares	December 16, 2025	$	560.00		267
April 2016	Common Shares	April 1, 2026	$	608.00		250
May 2016	Common Shares	May 11, 2021	$	774.00		50
June 2016	Common Shares	June 20, 2026	$	498.00		1,004
May 2017	Common Shares	May 25, 2027	$	950.00		2,220
						5,549