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Note 2 - Summary of Significant Accounting Policies (Details Textual)		3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 20, 2020 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Jan. 22, 2021 USD ($)
Accounts Receivable, Allowance for Credit Loss, Current		$ 58,000		$ 58,000		$ 12,000
Inventory Valuation Reserves		212,000		212,000		158,000
Income (Loss) from Equity Method Investments				(12,000)	$ (15,000)
Impairment of Intangible Assets (Excluding Goodwill)		0	$ 0	0	0
Contract with Customer, Liability		10,000		10,000
Contract with Customer, Liability, Revenue Recognized				7,000
Customer Deposit Liability, Current		113,000		113,000		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		$ 807,000		$ 807,000		$ 867,000
Operating Lease, Liability		$ 818,000		$ 818,000
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
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	$ 8,000	$ 12,000	$ 15,000
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%