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Note 17 - Segment Reporting - Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 3,265	$ 3,826	$ 10,999	$ 10,761
Operating loss	$ (1,116)	$ (457)	$ (4,205)	$ (4,991)
Operating loss, percentage	100.00%	100.00%	100.00%	100.00%
Product [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 3,255	$ 3,816	$ 10,971	$ 10,743
Total of Revenue	100.00%	100.00%	100.00%	100.00%
Optical and Wound Care [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 2,481	$ 2,507	$ 8,354	$ 7,646
Operating loss	$ (698)	$ (257)	$ (3,094)	$ (3,605)
Operating loss, percentage	63.00%	56.00%	74.00%	72.00%
Optical and Wound Care [Member] | Product [Member]
Total of Revenue	76.00%	66.00%	76.00%	71.00%
Skin Care [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 784	$ 1,319	$ 2,645	$ 3,115
Operating loss	$ (418)	$ (200)	$ (1,111)	$ (1,386)
Operating loss, percentage	37.00%	44.00%	26.00%	28.00%
Skin Care [Member] | Product [Member]
Total of Revenue	24.00%	34.00%	24.00%	29.00%

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