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
Jun. 30, 2020
Dec. 31, 2019
Accounts receivable, allowance for doubtful accounts $ 463 $ 407 [1]
Convertible preferred stock, shares authorized (in shares) 10,000,000 10,000,000
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) 15,734,058 7,075,684 [1]
Common stock, shares outstanding (in shares) 15,734,058 7,075,684 [1]
Series A Preferred Stock [Member]    
Convertible preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Convertible preferred stock, shares issued (in shares) 0 1,852,173
Convertible preferred stock, shares outstanding (in shares) 0 1,852,173
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) 33,685 31,678 [1]
Convertible preferred stock, shares outstanding (in shares) 33,685 31,678 [1]
[1] The condensed consolidated balance sheet as of December 31, 2019 has been derived from the audited consolidated financial statements as of that date.