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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