v3.23.1

Note 1 - Nature of Operations (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended		12 Months Ended
	Dec. 15, 2021	Jun. 17, 2020	Nov. 30, 2022	Feb. 28, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 09, 2020	Jun. 16, 2020
Retained Earnings (Accumulated Deficit), Total					$ (224,105)	$ (180,405)
Proceeds from Issuance of Common Stock					$ 2,135	$ 0
Common Stock, Par or Stated Value Per Share (in dollars per share)					$ 0.0001	$ 0.0001	$ 0.0001
Proceeds from Issuance of Private Placement	$ 16,740
Proceeds from Warrant Exercises					$ 0	$ 903
Venus Spain [Member] | Employee Severance and Retention [Member]
Restructuring Charges, Total					$ 102
December 2020 Public Offering Warrants [Member]
Class of Warrant or Right, Exercised During Period (in shares)				361,200
Class of Warrant or Right, Exercised During Period, Exercise Price (in dollars per share)				$ 2.50
Proceeds from Warrant Exercises				$ 903
Series A Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001
Proceeds from Issuance of Private Placement	$ 4,514
Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)					7,585,529
Proceeds from Issuance of Private Placement	12,074
Equity Purchase Agreement [Member] | Lincoln Park [Member]
Equity Purchase Agreement, Maximum Offering Amount								$ 31,000
Agreement Term (Year)								2 years
Proceeds from Issuance of Common Stock					$ 272
Stock Issued During Period, Shares, New Issues (in shares)		3,437,087			400,000
Common Stock, Par or Stated Value Per Share (in dollars per share)								$ 0.0001
The 2021 Private Placement [Member]
Proceeds from Issuance of Private Placement	$ 16,999				$ 0	$ 16,740
The 2021 Private Placement [Member] | Series A Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)	3,790,755
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001
The 2021 Private Placement [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)	9,808,418
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001					$ 0.0001
The 2022 Private Placement [Member]
Proceeds from Issuance of Private Placement			$ 6,720		$ 6,518	$ 0
The 2022 Private Placement [Member] | Series A Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)			3,185,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.0001
The 2022 Private Placement [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)			1,750,000
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.0001

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