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Note 5 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 29, 2019
Jan. 16, 2019
Jun. 22, 2018
Sep. 07, 2017
Mar. 31, 2019
Mar. 31, 2018
Stock Issued During Period, Value, Issued for Services           $ 206,000 $ 197,000
Share Price     $ 0.22        
2018 Equity Incentive Plan [Member]              
Shares Issued, Price Per Share $ 0.16         $ 0.16  
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           890,280  
The 2007 Equity Incentive Plan [Member]              
Shares Issued, Price Per Share 0.16         $ 0.16  
Non Plan [Member]              
Shares Issued, Price Per Share $ 0.16         $ 0.16  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           731,250 619,435
Selling, General and Administrative Expenses [Member]              
Share-based Payment Arrangement, Expense           $ 352,000 $ 320,000
Maximum [Member] | The 2007 Equity Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period         10 years    
Officer [Member]              
Stock Issued During Period, Shares, Issued for Services 323,030 579,996          
Shares Issued, Price Per Share $ 0.26 $ 0.16       $ 0.26  
Stock Issued During Period, Value, Issued for Services $ 84,000 $ 93,000          
Consultants [Member]              
Stock Issued During Period, Shares, Issued for Services           788,907 1,008,478
Stock Issued During Period, Value, Issued for Services           $ 138,000 $ 277,000
Consultants [Member] | Minimum [Member]              
Shares Issued, Price Per Share $ 0.16         $ 0.16 $ 0.25
Consultants [Member] | Maximum [Member]              
Shares Issued, Price Per Share 0.23         0.23 $ 0.41
Chief Financial Officer [Member] | 2018 Equity Incentive Plan [Member]              
Shares Issued, Price Per Share 0.22         $ 0.22  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           300,000  
Chief Financial Officer [Member] | Equity Incentive Plan 2007 [Member]              
Share-based Payment Arrangement, Expense           $ 67,000  
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        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Remaining Number of Shares to Vest Each Month     25,000        
Chief Financial Officer [Member] | Selling, General and Administrative Expenses [Member] | Equity Incentive Plan 2007 [Member]              
Share-based Payment Arrangement, Expense           $ 17,000  
Employees [Member] | 2018 Equity Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           168,404  
Employees [Member] | Minimum [Member] | 2018 Equity Incentive Plan [Member]              
Shares Issued, Price Per Share 0.16         $ 0.16  
Employees [Member] | Maximum [Member] | 2018 Equity Incentive Plan [Member]              
Shares Issued, Price Per Share 0.25         $ 0.25  
Employees and CFO [Member] | Selling, General and Administrative Expenses [Member] | 2018 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Payment Arrangement, Expense           $ 36,000  
Board Of Directors [Member] | 2018 Equity Incentive Plan [Member]              
Shares Issued, Price Per Share 0.16         $ 0.16  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           421,876  
Board Of Directors [Member] | Selling, General and Administrative Expenses [Member] | 2018 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member]              
Share-based Payment Arrangement, Expense           $ 68,000  
Vendors [Member] | Non Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           731,250  
Vendors [Member] | Selling, General and Administrative Expenses [Member] | Non Plan [Member]              
Share-based Payment Arrangement, Expense           $ 139,000  
Vendors [Member] | Minimum [Member] | Non Plan [Member]              
Shares Issued, Price Per Share 0.16         $ 0.16  
Vendors [Member] | Maximum [Member] | Non Plan [Member]              
Shares Issued, Price Per Share $ 0.25         $ 0.25  
Board of Directors and Vendors [Member] | Non Plan [Member]              
Stock Issued During Period, Value, Issued for Services             $ 158,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           619,435  
Board of Directors and Vendors [Member] | Minimum [Member] | Non Plan [Member]              
Shares Issued, Price Per Share             $ 0.26
Board of Directors and Vendors [Member] | Maximum [Member] | Non Plan [Member]              
Shares Issued, Price Per Share             $ 0.28