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Note 17 - Segment Reporting - Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 3,124	$ 3,273
Operating loss	$ (1,734)	$ (2,382)
Operating loss, percentage	100.00%	100.00%
Product [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 3,117	$ 3,267
Total of Revenue	100.00%	100.00%
Optical and Wound Care [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 2,339	$ 2,230
Operating loss	$ (1,335)	$ (2,039)
Operating loss, percentage	77.00%	86.00%
Optical and Wound Care [Member] | Product [Member]
Total of Revenue	75.00%	68.00%
Skin Care [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 785	$ 1,043
Operating loss	$ (399)	$ (343)
Operating loss, percentage	23.00%	14.00%
Skin Care [Member] | Product [Member]
Total of Revenue	25.00%	32.00%

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