Note 11 - Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended
	Jun. 30, 2022	Feb. 17, 2022	Feb. 03, 2022	Mar. 31, 2023	Mar. 31, 2022	Mar. 27, 2023	Dec. 31, 2022
Common Stock, Par or Stated Value Per Share (in dollars per share)				$ 0.01		$ 0.01	$ 0.01
Warrants With Securities Purchase Agreement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			438,334
Class of Warrant or Right, Fair Value Per Warrant (in dollars per share)					$ 1.7445		$ 3.2781
Fair Value Adjustment of Warrants					$ 3,664
Pre-funded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			1,950,502
Common Stock Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			1,950,502
Warrants and Rights Outstanding, Term (Year)			5 years
Class of Warrant or Right, Outstanding (in shares)	2,388,836
Class of Warrant or Right, Extension Term (Year)	1 year
Lender Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		1,731,499		1,731,499
Warrants and Rights Outstanding, Term (Year)		5 years					5 years
Class of Warrant or Right, Fair Value Per Warrant (in dollars per share)					$ 1.626		$ 2.4387
Fair Value Adjustment of Warrants					$ (1,408)
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 6.00		$ 6.00
Debt Instrument, Unamortized Discount, Increase							$ 4,223
Class of Warrant or Right, Outstanding (in shares)	1,731,499
Purchaser Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		466,667
Warrants and Rights Outstanding, Term (Year)		5 years
Class of Warrant or Right, Fair Value Per Warrant (in dollars per share)					$ 1.7445		$ 2.5968
Fair Value Adjustment of Warrants					$ 397
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 4.23
Class of Warrant or Right, Waiver Fee		$ 175
Class of Warrant or Right, Stated Price Per Share (in dollars per share)		$ 0.375
Warrant Issuance Expense		$ 1,211		$ (0)	$ 1,212
Class of Warrant or Right, Outstanding (in shares)	466,667
Securities Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)			438,334
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.01
Sale of Common Stock and Warrants, Price Per Share (in dollars per share)			4.605
Common Stock and Pre-funded Warrants [Member]
Sale of Common Stock and Warrants, Price Per Share (in dollars per share)			$ 4.6047
Common Stock and Warrants [Member]
Proceeds from Issuance or Sale of Equity, Total			$ 11,000