Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)

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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts receivable, allowance for doubtful accounts $ 49 $ 124 [1]
Convertible preferred stock, shares authorized (in shares) 10,000,000 10,000,000 [1]
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001 [1]
Common stock, shares authorized (in shares) 75,000,000 75,000,000 [1]
Common stock, shares issued (in shares) 10,602,560 2,171,316 [1]
Common stock, shares outstanding (in shares) 10,602,560 2,171,316 [1]
Series B Preferred Stock [Member]    
Convertible preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001 [1]
Convertible preferred stock, shares issued (in shares) 39,279 35,819 [1]
Convertible preferred stock, shares outstanding (in shares) 39,279 35,819 [1]
Series C Preferred Stock [Member]    
Convertible preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Convertible preferred stock, shares issued (in shares) 0 0
Convertible preferred stock, shares outstanding (in shares) 0 0
[1] The condensed consolidated balance sheet as of December 31, 2020 has been derived from the audited consolidated financial statements as of that date.