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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
9 Months Ended
Mar. 20, 2020
Jan. 01, 2019
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss, Current     $ 12,000   $ 12,000
Inventory Valuation Reserves, Ending Balance     3,000   3,000
Income (Loss) from Equity Method Investments     (15,000) $ (23,000)  
Impairment, Long-Lived Asset, Held-for-Use, Total     0 $ 0  
Contract with Customer, Liability, Total     6,000   89,000
Contract with Customer, Refund Liability, Total     0    
Unrecognized Tax Benefits, Ending Balance     0   0
Operating Lease, Right-of-Use Asset     $ 896,000   $ 453,000
Accounting Standards Update 2016-02 [Member]          
Increase (Decrease) in Operating Lease, Right-of-use Assets   $ 399,000      
Canadian Government Grants [Member]          
Number of Grants Received     80    
Grants Receivable     $ 3,700,000    
Canadian Government Grants [Member] | Other Income [Member]          
Proceeds from Income Tax Refunds     $ 54,000    
Canadian Government Grants [Member] | Minimum [Member]          
Grant Term (Year)     9 years    
Canadian Government Grants [Member] | Maximum [Member]          
Grant Term (Year)     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 $ 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