Note 8 - Noncontrolling Interest - Clyra Medical - Valuation Assumptions (Details)	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Clyra Medical [Member] \| Vendors and Employees [Member]
Risk free interest rate		2.32%
Expected volatility	40.00%	40.00%
Expected life in years (Year)	10 years	10 years
Maximum [Member] \| Clyra Medical [Member] \| Vendors and Employees [Member]
Risk free interest rate	4.27%
Non Plan [Member]
Risk free interest rate	3.48%
Expected volatility	114.00%
Expected life in years (Year)	10 years	10 years
Non Plan [Member] \| Minimum [Member]
Risk free interest rate		2.32%
Expected volatility		114.00%
Non Plan [Member] \| Minimum [Member] \| Clyra Medical [Member] \| Vendors and Employees [Member]
Risk free interest rate	3.88%
Non Plan [Member] \| Maximum [Member]
Risk free interest rate		3.83%
Expected volatility		117.00%

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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