Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Trade accounts receivable, less allowances	$ 16	$ 28
Preferred stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Preferred stock, authorized (in shares)	5,000,000	2,000,000
Preferred Stock, Shares Issued	2,709,018	0
Preferred stock, outstanding (in shares)	2,709,018	0
Common stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	50,000,000	30,000,000
Common stock, issued (in shares)	15,896,632	12,428,418
Common stock, outstanding (in shares)	15,896,632	12,428,418
Series A Convertible Preferred Stock
Preferred stock, authorized (in shares)	3,300,000	0