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Note 13 - Subsequent Events (Details Textual) - USD ($)
3 Months Ended 5 Months Ended 12 Months Ended
Mar. 30, 2020
Mar. 28, 2020
Mar. 20, 2020
Mar. 10, 2020
Feb. 25, 2020
Jan. 31, 2020
Jan. 16, 2019
Jun. 22, 2018
Mar. 31, 2020
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Stock Issued During Period, Value, New Issues                     $ 125,000 $ 839,000
Debt Conversion, Converted Instrument, Shares Issued                     1,735,000 6,190,000
2018 Equity Incentive Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                   1,318,517 7,895,839 1,318,517
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price                   $ 0.30 $ 0.25  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period               10 years        
2018 Equity Incentive Plan [Member] | Chief Financial Officer [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             300,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares                     75,000  
Subsequent Event [Member] | Vista Capital Note Converted into Common Stock [Member]                        
Debt Conversion, Converted Instrument, Shares Issued                 2,079,359      
Subsequent Event [Member] | Clyra Medical Technology Inc [Member]                        
Stock Issued During Period, Value, New Issues   $ 250,000                    
Subsequent Event [Member] | Odin Co Ltd [Member]                        
Payments to Acquire Interest in Joint Venture     $ 100,000                  
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage     40.00%                  
Subsequent Event [Member] | Odin Co Ltd [Member] | BKT and Tomorrow Water [Member]                        
Payments to Acquire Interest in Joint Venture     $ 150,000                  
Subsequent Event [Member] | Odin Co Ltd [Member] | BKT Tech Co Ltd [Member]                        
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage     30.00%                  
Subsequent Event [Member] | Odin Co Ltd [Member] | Tomorrow Water [Member]                        
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage     30.00%                  
Subsequent Event [Member] | President/CEO and Chief Science Officer [Member]                        
Employee-related Liabilities, Total $ 110,000                      
Subsequent Event [Member] | Officers, Board Members, and Vendors [Member]                        
Accounts Payable, Converted Original Amount                 $ 285,000      
Accounts Payable, Converted, Shares Issued                 920      
Subsequent Event [Member] | 2018 Equity Incentive Plan [Member]                        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price         $ 0.21              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period         10 years              
Subsequent Event [Member] | 2018 Equity Incentive Plan [Member] | Chief Financial Officer [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross, Per Month         25,000              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         400,000              
Sharebased Compensation Arrangement By Sharebased Payment Award Options Expiration Period Extension         1 year 120 days              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Remaining Number of Shares to Vest Each Month           25,000            
Subsequent Event [Member] | LPC Purchase Agreement [Member]                        
Stock Purchase Agreement, Shares to be Purchased 1,785,715                      
Stock Purchase Agreement, Immediate Investment $ 250,000                      
Stock Purchase Agreement, Maximum Amount of Common Stock $ 10,250,000                      
Subsequent Event [Member] | LPC Purchase Agreement [Member]                        
Stock Issued During Period, Shares, New Issues                 1,398,563      
Stock Issued During Period, Value, New Issues                 $ 287,965      
Subsequent Event [Member] | Additional Commitment Shares [Member]                        
Stock Issued During Period, Shares, New Issues                 14,080      
Subsequent Event [Member] | Additional Commitment Shares [Member] | LPC Purchase Agreement [Member]                        
Stock Issued During Period, Shares, New Issues 2,928,571                      
Stock Purchase Agreement, Commitment Fee Percentage 4.00%                      
Subsequent Event [Member] | Sale of Stock Related to BKI Investment [Member]                        
Stock Issued During Period, Shares, New Issues       1,593,807                
Stock Issued During Period, Value, New Issues       $ 350,000