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Note 5 - Share-based Compensation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Feb. 25, 2020
Jun. 22, 2018
Sep. 07, 2017
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Stock Issued During Period, Value, Issued for Services         $ 178,000 $ 206,000
Stock Issued During Period, Value, New Issues         $ 901,000  
Share Price (in dollars per share) $ 0.21     $ 0.16 $ 0.16  
2018 Equity Incentive Plan [Member]            
Shares Issued, Price Per Share (in dollars per share)       0.16 $ 0.16  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   40,000,000        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Per Year (in shares)   2,000,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)         1,343,344 890,280
Equity Incentive Plan 2007 [Member]            
Share-based Payment Arrangement, Expense         $ 65,000  
The 2007 Equity Incentive Plan [Member]            
Shares Issued, Price Per Share (in dollars per share)       0.16 $ 0.16  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     10 years      
Non Plan [Member]            
Shares Issued, Price Per Share (in dollars per share)       0.16 $ 0.16  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)         292,437 731,250
Selling, General and Administrative Expenses [Member]            
Share-based Payment Arrangement, Expense         $ 352,000 $ 320,000
Common Stock Issued for Accrued Interest Due on Promissory Note [Member]            
Shares Issued, Price Per Share (in dollars per share)       0.17 $ 0.17  
Stock Issued During Period, Shares, New Issues (in shares)         19,278 139,362
Stock Issued During Period, Value, New Issues         $ 4,000 $ 25,000
Common Stock Issued for Accrued Interest Due on Promissory Note [Member] | Minimum [Member]            
Shares Issued, Price Per Share (in dollars per share)           $ 0.17
Common Stock Issued for Accrued Interest Due on Promissory Note [Member] | Maximum [Member]            
Shares Issued, Price Per Share (in dollars per share)           $ 0.23
Officer [Member]            
Stock Issued During Period, Shares, Issued for Services (in shares)         648,755 579,996
Shares Issued, Price Per Share (in dollars per share)       0.17 $ 0.17 $ 0.16
Stock Issued During Period, Value, Issued for Services         $ 110,000 $ 93,000
Consultants [Member]            
Stock Issued During Period, Shares, Issued for Services (in shares)         390,735 649,545
Shares Issued, Price Per Share (in dollars per share)       0.17 $ 0.17 $ 0.16
Stock Issued During Period, Value, Issued for Services         $ 67,000 $ 113,000
Consultants [Member] | 2018 Equity Incentive Plan [Member]            
Stock Issued During Period, Value, Issued for Services           $ 11,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)           64,706
Chief Financial Officer [Member] | 2018 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 427,500       300,000  
Share Price (in dollars per share)       $ 0.22 $ 0.22  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares)       177,500    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Remaining Number of Shares to Vest Each Month (in shares) 250,000          
Board Of Directors [Member] | Equity Incentive Plan 2007 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)         397,058  
Share Price (in dollars per share)       $ 0.17 $ 0.17  
Employees, Consultations, Offers, and Directors [Member] | 2018 Equity Incentive Plan [Member]            
Share-based Payment Arrangement, Expense         $ 76,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)         454,080  
Share Price (in dollars per share)       0.17 $ 0.17  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         4 years  
Vendors [Member] | Non Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)         292,437 731,250
Vendors [Member] | Non Plan [Member] | Share-based Payment Arrangement, Option [Member]            
Share-based Payment Arrangement, Expense         $ 50,000 $ 139,000
Vendors [Member] | Minimum [Member] | Non Plan [Member]            
Shares Issued, Price Per Share (in dollars per share)       0.17 $ 0.17 $ 0.16
Vendors [Member] | Maximum [Member] | Non Plan [Member]            
Shares Issued, Price Per Share (in dollars per share)       $ 0.21 $ 0.21 $ 0.25