Note 14 - Warrant Liabilities - Warrant Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Mar. 31, 2023	Mar. 31, 2022
Warrant liabilities as of the closing date	$ 13	$ 257	$ 13	$ 257			$ 84	$ 1,244
Change in fair value of warrants	(71)	(987)	(172)	(1,782)	$ 185	$ 2,039
Investor Warrants Issued in Connection with 2021 Financing [Member]
Warrant liabilities as of the closing date	12	167	12	167	86	964	49	626
Change in fair value of warrants	(37)	(459)	(74)	(797)	86	964
Placement Agent Warrants Issued in Connection with 2021 Financing [Member]
Warrant liabilities as of the closing date	1	22	1	22	9	132	5	84
Change in fair value of warrants	(4)	(62)	(8)	(110)	9	132
Investor Warrants Issued in Connection with 2020 Financing [Member]
Warrant liabilities as of the closing date	0	57	0	57	76	795	25	449
Change in fair value of warrants	(25)	(392)	(76)	(738)	76	795
Placement Agent Warrants Issued in Connection with 2020 Financing [Member]
Warrant liabilities as of the closing date	0	11	0	11	14	148	$ 5	$ 85
Change in fair value of warrants	$ (5)	$ (74)	$ (14)	$ (137)	$ 14	$ 148