Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss, Current	$ 73	$ 6
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)	60,961	56,451
Preferred Stock, Shares Outstanding, Ending Balance (in shares)	60,961	56,451
Preferred Stock, Liquidation Preference, Value	$ 60,876	$ 56,366
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001	$ 0.001
Common Stock, Shares Authorized (in shares)	100,000,000	100,000,000
Common Stock, Shares, Issued (in shares)	7,832,644	4,778,263
Common Stock, Shares, Outstanding, Ending Balance (in shares)	7,832,644	4,778,263