Note 13 - Subsequent Events (Details Textual) - USD ($)		1 Months Ended	3 Months Ended
	Dec. 20, 2022	May 12, 2023	Mar. 31, 2023	Mar. 31, 2022
Proceeds from Issuance of Common Stock			$ 800,000	$ 1,202,000
Proceeds from Issuance of Preferred Stock and Preference Stock			$ 225,000	$ 0
Clyra Medical [Member]
Shares Issued, Price Per Share (in dollars per share)	$ 310
Series A Preferred Stock [Member] | Clyra Medical [Member]
Stock Issued During Period, Shares, New Issues (in shares)	725		725
Proceeds from Issuance of Preferred Stock and Preference Stock	$ 225,000		$ 225,000
Shares Issued, Price Per Share (in dollars per share)	$ 372
Subsequent Event [Member] | Clyra Medical [Member] | Warrant [Member]
Warrants and Rights Outstanding, Term (Year)		3 years
Shares Issued, Price Per Share (in dollars per share)		$ 372
Subsequent Event [Member] | Series A Preferred Stock [Member] | Clyra Medical [Member]
Stock Issued During Period, Shares, New Issues (in shares)		401
Proceeds from Issuance of Preferred Stock and Preference Stock		$ 124,000
Lincoln Park Capital Fund, LLC [Member]
Stock Issued During Period, Shares, New Issues (in shares)			545,402	1,506,821
Proceeds from Issuance of Common Stock			$ 105,000	$ 346,000
Lincoln Park Capital Fund, LLC [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)		567,713
Proceeds from Issuance of Common Stock		$ 101,000