Note 10 - Noncontrolling Interest - Clyra Medical - Common Shares Outstanding (Details) - Clyra Medical [Member] - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Options outstanding, balance (in shares)	14,004	11,411
Balance (in dollars per share)	$ 1.00	$ 1.00
Options granted (in shares)	1,829	2,594
Granted (in dollars per share)	$ 40.24	$ 1.00
Options outstanding, balance (in shares)	15,833	14,004
Balance (in dollars per share)	$ 5.53	$ 1.00
Maximum [Member]
Balance, Exercise Price Range (in shares)	1.00	1.00
Granted, Exercise Price (in dollars per share)	$ 310	$ 1.00
Balance, Exercise Price Range (in shares)	310	1.00
Minimum [Member]
Granted, Exercise Price (in dollars per share)	$ 1.00
Balance, Exercise Price Range (in shares)	1.00