Note 9 - Preferred Stock and Common Stock Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended			3 Months Ended		9 Months Ended
	Jan. 15, 2020	May 31, 2019	Sep. 30, 2018	Aug. 31, 2018	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Gain (Loss) on Revaluation of Warrants					$ 8,339	$ (197)
Series A Convertible Preferred Stock [Member]
Temporary Equity, Stock Issued During Period, Shares, New Issues (in shares)				50,000
Temporary Equity, Par or Stated Value Per Share (in dollars per share)				$ 0.0001
Temporary Equity, Issued Price Per Share (in dollars per share)				$ 1,000
Temporary Equity, Stock Issued During Period, Value, New Issues				$ 50,000
Temporary Equity, Stock Issued During Period, Shares Issued for Services (in shares)				1,000
Accretion of Discount Amount					2,500
Temporary Equity, Accretion of Dividends					100	600
Series B Convertible Preferred Stock [Member]
Temporary Equity, Stock Issued During Period, Shares, New Issues (in shares)		20,945	29,055
Temporary Equity, Par or Stated Value Per Share (in dollars per share)			$ 0.0001
Temporary Equity, Issued Price Per Share (in dollars per share)		$ 1,000	$ 1,000
Temporary Equity, Stock Issued During Period, Value, New Issues		$ 20,945	$ 29,055
Temporary Equity, Stock Issued During Period, Shares Issued for Services (in shares)		418	581
Convertible Preferred Stock [Member]
Temporary Equity, Issued Price Per Share (in dollars per share)							$ 1,000
Temporary Equity, Dividend Rate Percentage							12.00%
Dividends, Preferred Stock, Paid-in-kind	$ 3,400				$ 3,400	$ 11,200