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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 ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Accounts Receivable, Allowance for Credit Loss, Current   $ 12,000   $ 12,000   $ 12,000
Inventory Valuation Reserves, Ending Balance   3,000   3,000   3,000
Security Deposit   35,000   35,000    
Income (Loss) from Equity Method Investments       (15,000) $ (23,000)  
Impairment, Long-Lived Asset, Held-for-Use, Total       0 0 342,000
Contract With Customer, Liability, Revenue Recognized During Period       970,000    
Contract with Customer, Liability, Total   0   0   89,000
Contract with Customer, Asset, after Allowance for Credit Loss, Total   0   0    
Unrecognized Tax Benefits, Ending Balance   0   0   0
Operating Lease, Right-of-Use Asset   $ 390,000   $ 390,000   $ 453,000
Lessee, Operating Lease, Discount Rate   18.00%   18.00%    
Corporate Office Lease [Member]            
Lessee, Operating Lease, Renewal Term (Year)   4 years   4 years    
Oak Ridge, Tennessee Facility Lease [Member]            
Lessee, Operating Lease, Renewal Term (Year)   5 years   5 years    
Lessee, Operating Lease, Option to Extend Term (Year)       3 years    
Canadian Government Grants [Member]            
Number of Grants Received       80    
Grants Receivable   $ 3,700,000   $ 3,700,000    
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%          
Income (Loss) from Equity Method Investments   8,000 $ 13,000 $ 15,000 $ 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   $ 34,000