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Note 17 - Segment Reporting - Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue from Contract with Customer, Including Assessed Tax	$ 4,610	$ 3,662	$ 7,734	$ 6,935
Operating loss	$ (1,355)	$ (2,152)	$ (3,089)	$ (4,534)
Operating loss, percentage	100.00%	100.00%	100.00%	100.00%
Product [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 4,599	$ 3,660	$ 7,716	$ 6,927
Total of Revenue	100.00%	100.00%	100.00%	100.00%
Optical and Wound Care [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 3,534	$ 2,910	$ 5,873	$ 5,140
Operating loss	$ (1,062)	$ (1,308)	$ (2,396)	$ (3,347)
Operating loss, percentage	78.00%	61.00%	78.00%	74.00%
Optical and Wound Care [Member] | Product [Member]
Total of Revenue	77.00%	79.00%	76.00%	74.00%
Skin Care [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 1,076	$ 752	$ 1,861	$ 1,795
Operating loss	$ (293)	$ (844)	$ (693)	$ (1,187)
Operating loss, percentage	22.00%	39.00%	22.00%	26.00%
Skin Care [Member] | Product [Member]
Total of Revenue	23.00%	21.00%	24.00%	26.00%

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