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Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss, Current $ 24 $ 73
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 Outstanding (in shares) 60,961 60,961
Preferred Stock, Shares Issued (in shares) 60,961 60,961
Preferred Stock, Liquidation Preference, Value $ 60,876 $ 60,876
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, Outstanding (in shares) 9,338,645 7,832,644
Common Stock, Shares, Issued (in shares) 9,338,645 7,832,644