Note 10 - Noncontrolling Interest - Clyra Medical - Common Shares Outstanding (Details) - Clyra Medical [Member] - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Clyra options outstanding, balance (in shares)	1,583,329	1,400,421
Weighted average price, balance (in dollars per share)	$ 0.06	$ 0.01
Options outstanding, Granted (in shares)	191,981	182,908
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 0.01	$ 0.4
Options outstanding, Exercised (in shares)	(296,389)
Weighted average price, Exercised (in dollars per share)	$ 1.97
Clyra options outstanding, balance (in shares)	1,478,921	1,583,329
Weighted average price, balance (in dollars per share)	$ 0.31	$ 0.06
Balance, Weighted Average Remaining Term (Year)	7 years
Options outstanding, Non-vested (in shares)	(21,525)
Weighted average price, Unvested (in dollars per share)	$ 2.71
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	1,457,396
Weighted average price, balance (in dollars per share)	$ 0.28