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Note 5 - Share-based Compensation (Details Textual) - USD ($)
5 Months Ended 9 Months Ended 12 Months Ended
Jul. 23, 2019
Jul. 05, 2019
May 28, 2019
Jan. 31, 2019
Jan. 16, 2019
Jun. 22, 2018
Sep. 07, 2017
Dec. 31, 2018
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Feb. 08, 2018
Shares Issued, Price Per Share               $ 0.25     $ 0.25  
Stock Issued During Period, Value, Issued for Services                   $ 710,000 $ 908,000  
Stock Issued During Period, Value, New Issues                   $ 125,000 $ 839,000  
Share Price                   $ 0.22   $ 0.3147
2018 Equity Incentive Plan [Member]                        
Shares Issued, Price Per Share                   $ 0.22    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period           10 years            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           40,000,000            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Per Year           2,000,000            
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    
The 2007 Equity Incentive Plan [Member]                        
Shares Issued, Price Per Share                   0.22    
Non Plan [Member]                        
Shares Issued, Price Per Share                   $ 0.22    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                   1,226,586 1,701,088  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price                   $ 0.21 $ 0.26  
Common Stock Issued for Accrued Interest Due on Promissory Note [Member]                        
Stock Issued During Period, Shares, New Issues                   927,318 2,042,196  
Stock Issued During Period, Value, New Issues                   $ 200,000 $ 524,000  
Minimum [Member] | Common Stock Issued for Accrued Interest Due on Promissory Note [Member]                        
Shares Issued, Price Per Share               0.23   $ 0.10 $ 0.23  
Maximum [Member] | The 2007 Equity Incentive Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period             10 years          
Maximum [Member] | Common Stock Issued for Accrued Interest Due on Promissory Note [Member]                        
Shares Issued, Price Per Share               0.42   $ 0.35 $ 0.42  
Officer [Member]                        
Stock Issued During Period, Shares, Issued for Services                   1,080,951 1,131,036  
Stock Issued During Period, Value, Issued for Services                   $ 210,000 $ 319,000  
Lock-up Agreement, Vesting Requirement, Commercialization of Product, Receipt in Cash                   $ 3,000,000    
Officer [Member] | Minimum [Member]                        
Shares Issued, Price Per Share               0.24   $ 0.17 $ 0.24  
Officer [Member] | Maximum [Member]                        
Shares Issued, Price Per Share               0.43   $ 0.32 $ 0.43  
Consultants [Member]                        
Stock Issued During Period, Shares, Issued for Services                   2,237,539 2,083,085  
Stock Issued During Period, Value, Issued for Services                   $ 500,000 $ 589,000  
Consultants [Member] | Minimum [Member]                        
Shares Issued, Price Per Share               0.23   $ 0.17 $ 0.23  
Consultants [Member] | Maximum [Member]                        
Shares Issued, Price Per Share               0.42   $ 0.32 $ 0.42  
Employees and Consultants [Member] | 2018 Equity Incentive Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                   6,614,381 630,289  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                 4 years      
Employees and Consultants [Member] | Minimum [Member] | 2018 Equity Incentive Plan [Member]                        
Shares Issued, Price Per Share               0.22   $ 0.16 $ 0.22  
Employees and Consultants [Member] | Maximum [Member] | 2018 Equity Incentive Plan [Member]                        
Shares Issued, Price Per Share               0.43   $ 0.40 $ 0.43  
Board Of Directors [Member] | 2018 Equity Incentive Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                   1,281,458 688,228  
Board Of Directors [Member] | Non Plan [Member]                        
Share-based Payment Arrangement, Expense                   $ 260,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                     1,701,088  
Board Of Directors [Member] | Minimum [Member] | 2018 Equity Incentive Plan [Member]                        
Shares Issued, Price Per Share               0.24   $ 0.16 $ 0.24  
Board Of Directors [Member] | Minimum [Member] | Non Plan [Member]                        
Shares Issued, Price Per Share               0.23     0.23  
Board Of Directors [Member] | Maximum [Member] | 2018 Equity Incentive Plan [Member]                        
Shares Issued, Price Per Share               0.43   $ 0.32 0.43  
Board Of Directors [Member] | Maximum [Member] | Non Plan [Member]                        
Shares Issued, Price Per Share               $ 0.43     $ 0.43  
Employees, Consultations, Offers, and Directors [Member] | 2018 Equity Incentive Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                   7,895,839    
Chief Financial Officer [Member] | 2018 Equity Incentive Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         300,000              
Share Price         $ 0.22              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares                   75,000    
Chief Financial Officer [Member] | Equity Incentive Plan 2007 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares                     75,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Remaining Number of Shares to Vest Each Month       25,000                
Vice President of Operation and President of Subsidiary [Member] | 2018 Equity Incentive Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     1,200,000                  
Vice President of Operation and President of Subsidiary [Member] | Equity Incentive Plan 2007 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     1,000,000                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     5 years                  
Share Price     $ 0.17                  
Share-based Compensation Arrangement by Share-based Payment Award Options Annual Vesting Installment Shares     200,000                  
Vice President of Sales [Member] | 2018 Equity Incentive Plan [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     200,000                  
Share-based Compensation Arrangement by Share-based Payment Award Options Annual Vesting Installment Shares   100,000                    
Share-based Payment Arrangement, Amortization Term   91 days                    
Vice President of Sales [Member] | 2018 Equity Incentive Plan [Member] | Vesting Annually [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     1 year                  
Share Price     $ 0.17                  
Vice President of Sales [Member] | 2018 Equity Incentive Plan [Member] | Vesting At Various Metrics [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     1,000,000                  
Director of Business Development for Odor-No-More [Member] | 2018 Equity Incentive Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 1,000,000                      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 0.35                      
Director of Business Development for Odor-No-More [Member] | 2018 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Tranche One [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 90 days                      
Director of Business Development for Odor-No-More [Member] | 2018 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Tranche Two [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year                      
Director of Business Development for Odor-No-More [Member] | 2018 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Tranche Three [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 2 years                      
Vendors [Member] | Non Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                   1,226,586    
Vendors [Member] | Minimum [Member] | Non Plan [Member]                        
Shares Issued, Price Per Share                   $ 0.16    
Vendors [Member] | Maximum [Member] | Non Plan [Member]                        
Shares Issued, Price Per Share                   $ 0.32    
Sale of Products and License of Technology [Member]                        
Contract with Customer, Liability, Revenue Recognized     $ 3,000,000                  
Restricted Stock Units (RSUs) [Member] | Vice President of Operation and President of Subsidiary [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     500,000                  
Proceeds Cash, Trigger for Award as Unvested     $ 3,000,000                  
Vested Employee Stock Options [Member]                        
Share-based Payment Arrangement, Expense                   $ 1,522,000 $ 1,335,000  
Non Contingent Options [Member] | Director of Business Development for Odor-No-More [Member] | 2018 Equity Incentive Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 400,000                      
Non Contingent Options [Member] | Director of Business Development for Odor-No-More [Member] | 2018 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Tranche One [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 100,000                      
Non Contingent Options [Member] | Director of Business Development for Odor-No-More [Member] | 2018 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Tranche Two [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 100,000                      
Non Contingent Options [Member] | Director of Business Development for Odor-No-More [Member] | 2018 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Tranche Three [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 200,000                      
Contingent Options [Member] | Director of Business Development for Odor-No-More [Member] | 2018 Equity Incentive Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 600,000                      
Share-based Payment Arrangement, Option [Member] | Board Of Directors [Member] | Non Plan [Member]                        
Share-based Payment Arrangement, Expense                     434,000  
Share-based Payment Arrangement, Option [Member] | Board Of Directors [Member] | Non Plan [Member] | Selling, General and Administrative Expenses [Member]                        
Share-based Payment Arrangement, Expense                   $ 20,000 $ 414,000