Note 8 - Noncontrolling Interest - Clyra Medical - Common Shares Outstanding (Details) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Options outstanding, Granted (in shares)	0
Clyra Medical [Member]
Clyra options outstanding, balance (in shares)	1,478,922	1,583,329
Weighted average price, balance (in dollars per share)	$ 0.06	$ 0.06
Options outstanding, Granted (in shares)	25,833	42,582
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 4.05	$ 1.48
Weighted average remaining term, Outstanding (Year)	6 years 9 months 18 days	7 years 6 months
Clyra options outstanding, balance (in shares)	1,504,755
Weighted average price, balance (in dollars per share)	$ 0.38
Balance, Weighted Average Remaining Term (Year)	6 years 9 months 18 days	7 years 6 months
Unvested (in shares)	(12,300)
Weighted average price, Unvested (in dollars per share)	$ 2.71
Clyra options outstanding, balance (in shares)	1,492,455	1,625,911
Weighted average price, balance (in dollars per share)	$ 0.36	$ 0.09