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Note 20 - Segment Reporting - Financial Information by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 14,726	$ 14,404
Total sales, percentage	100.00%	100.00%
Operating loss	$ 7,596	$ 14,417
Operating loss, percentage	100.00%	100.00%
Product [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 14,687	$ 14,374
Optical and Wound Care [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 11,174	$ 10,239
Total sales, percentage	76.00%	71.00%
Operating loss	$ 3,650	$ 5,645
Operating loss, percentage	48.00%	39.00%
Skin Care [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 3,552	$ 4,165
Operating loss	$ 3,946	$ 8,772
Skin Care [Member] | Product [Member]
Total sales, percentage	24.00%	29.00%
Operating loss, percentage	52.00%	61.00%

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