Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounts Receivable, Allowance for Credit Loss, Current	$ 56	$ 41
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized (in shares)	5,000,000	5,000,000
Preferred Stock, Shares Issued (in shares)	19,229	62,881
Preferred Stock, Shares Outstanding (in shares)	19,229	62,881
Preferred Stock, Liquidation Preference, Value	$ 7,338	$ 62,796
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001
Common Stock, Shares Authorized (in shares)	100,000,000	100,000,000
Common Stock, Shares, Issued (in shares)	1,586,434	1,279,928
Common Stock, Shares, Outstanding (in shares)	1,586,434	1,279,928