Note 6 - Stock Warrants (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Apr. 26, 2022	Mar. 15, 2021
Class of Warrant or Right, Outstanding (in shares)	1,402,417		534,067
Class Of Warrant Or Right, Exercisable (in shares)			102,817
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		958,333
Class of Warrants or Rights, Expired During Period (in shares)	27,483
Class of Warrant or Right, Intrinsic Value	$ 0