Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Allowance for doubtful accounts	$ 68	$ 322
Common stock, Par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, Shares authorized (in shares)	750,000,000	750,000,000
Common stock, Shares issued (in shares)	215,039,868	206,844,580
Common stock, Shares outstanding (in shares)	215,039,868	206,844,580
Series C Preferred Stock [Member]
Temporary Equity, Shares Issued (in shares)	6,226,370	6,226,370
Temporary Equity, Shares Outstanding (in shares)	6,226,370	6,226,370
Series D Preferred Stock [Member]
Preferred stock, Shares issued (in shares)	1,177,023	1,177,023
Preferred stock, Shares outstanding (in shares)	1,177,023	1,177,023
Series E Preferred Stock [Member]
Preferred stock, Shares issued (in shares)	3,200,000
Preferred stock, Shares outstanding (in shares)		0