Note 9 - Net Income (Loss) Per Share of Common Stock (Details Textual) - shares	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2022
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	4,850,241
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	5,721,230	7,714,248	3,945,453
Pre-funded Warrants Related to Private Placement [Member]
Class of Warrant or Right, Outstanding (in shares)	15,870,199	15,870,199