Note 16 - Domestic and Foreign Revenues - Schedule of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Net sales	$ 446	$ 438	$ 403	$ 441	$ 524	$ 344	$ 370	$ 417	$ 1,728	$ 1,655
SPAIN
Net sales									330	65
CANADA
Net sales									137	54
FRANCE
Net sales									33	142
ROMANIA
Net sales									0	100
All Other Foreign Countries [Member]
Net sales									175	99
Non-US [Member]
Net sales									675	460
UNITED STATES
Net sales									$ 1,053	$ 1,195