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Note 2 - Summary of Significant Accounting Policies (Details Textual)		3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 20, 2020 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Oct. 22, 2021 USD ($)
Accounts Receivable, Allowance for Credit Loss, Current		$ 113,000		$ 113,000		$ 12,000
Inventory Valuation Reserves		212,000		212,000		158,000
Income (Loss) from Equity Method Investments				(18,000)	$ (15,000)
Impairment of Intangible Assets (Excluding Goodwill)		0	$ 0	0	0
Contract with Customer, Liability		2,000		2,000
Contract with Customer, Liability, Revenue Recognized				15,000
Customer Deposit Liability, Current		122,000		122,000		184,000
Unrecognized Tax Benefits, Ending Balance		$ 0		$ 0		0
Operating Lease, Weighted Average Remaining Lease Term (Year)		9 years		9 years
Operating Lease, Weighted Average Discount Rate, Percent		18.00%		18.00%
Operating Lease, Right-of-Use Asset		$ 777,000		$ 777,000		$ 867,000
Operating Lease, Liability		792,000		$ 792,000
Clyra Medical Technologies [Member]
Employee Retention Tax Credits Received		$ 41,000
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		3 years		3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		5 years		5 years
Canadian Government Grants [Member] \| Minimum [Member]
Grant Term (Month)				6 months
Canadian Government Grants [Member] \| Maximum [Member]
Grant Term (Month)				18 months
CANADA
Customer Deposit Liability, Current		$ 111,000		$ 111,000
Odin Co Ltd [Member]
Payments to Acquire Interest in Joint Venture	$ 100,000
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	40.00%			40.00%
Income (Loss) from Equity Method Investments		$ (6,000)	$ (15,000)	$ (18,000)	$ (23,000)
Odin Co Ltd [Member] \| Tomorrow Water [Member]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	30.00%
Odin Co Ltd [Member] \| BKT and Tomorrow Water [Member]
Payments to Acquire Interest in Joint Venture	$ 150,000
Patents [Member]
Intangible Assets, Net (Excluding Goodwill), Total							$ 34,000
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Number of Major Customers				1		3
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| One Customer [Member]
Concentration Risk, Percentage				10.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Three Customers [Member]
Concentration Risk, Percentage						10.00%