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Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Trade accounts receivable, less allowances $ 58 $ 26
Preferred stock, par value (USD per share) $ 0.0001 $ 0.0001
Preferred stock, authorized (in shares) 5,000,000 5,000,000
Preferred stock, issued (in shares) 876,447 876,447
Preferred stock, outstanding (in shares) 876,447 876,447
Common stock, par value (USD per share) $ 0.0001 $ 0.0001
Common stock, authorized (in shares) 50,000,000 50,000,000
Common stock, issued (in shares) 19,243,610 9,848,438
Common stock, outstanding (in shares) 19,243,610 9,848,438
Series A Convertible Preferred Stock    
Preferred stock, authorized (in shares) 3,300,000 3,300,000