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Note 2 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
Mar. 20, 2020
USD ($)
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
Jan. 19, 2019
USD ($)
Accounts Receivable, Allowance for Credit Loss, Current   $ 12,000 $ 12,000  
Inventory Valuation Reserves   158,000 3,000  
Payments to Acquire Intangible Assets   (0) 13,000  
Income (Loss) from Equity Method Investments   (15,000) (15,000)  
Impairment, Long-Lived Asset, Held-for-Use, Total   197,000 342,000  
Unrecognized Tax Benefits, Ending Balance   0 0  
Operating Lease, Right-of-Use Asset   867,000 $ 453,000 $ 399,000
Operating Lease, Liability, Total   $ 870,000    
Minimum [Member]        
Property, Plant and Equipment, Useful Life (Year)   3 years    
Maximum [Member]        
Property, Plant and Equipment, Useful Life (Year)   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% 40.00%  
Income (Loss) from Equity Method Investments   $ (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    
Payments to Acquire Intangible Assets   13,000    
Intangible Assets, Remaining Balance After Cash Payment Amount   $ 21,000    
Stock Issued During Period, Shares, Issued for Intangible Assets Purchase (in shares) | shares   125,000    
Shares Issued, Price Per Share (in dollars per share) | $ / shares   $ 0.17    
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member]        
Number of Major Customers   2 3  
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Two Customers [Member]        
Concentration Risk, Percentage   10.00%    
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Three Customers [Member]        
Concentration Risk, Percentage     10.00%  
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | One Customer [Member]        
Number of Major Customers   1    
Customer Concentration Risk [Member] | Accounts Receivable [Member]        
Number of Major Customers     2  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]        
Concentration Risk, Percentage     10.00%