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Note 6 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, xbrli-pure in Thousands
1 Months Ended 3 Months Ended
Sep. 07, 2017
Mar. 31, 2017
Feb. 10, 2017
Feb. 01, 2017
Mar. 31, 2018
Feb. 28, 2018
Jan. 31, 2018
Nov. 30, 2017
Mar. 31, 2018
Mar. 31, 2017
Share Based Compensation Arrangementby Share Based Payment Award Fair Value Assumptions Forfeiture Rate                 0.00%  
The 2007 Equity Incentive Plan [Member]                    
Allocated Share-based Compensation Expense, Total   $ 141,763                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                 300,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price                 $ 0.69
The 2007 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 Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     $ 0.69              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares     125,000              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Remaining Number of Shares to Vest Each Month     25,000              
Sharebased Compensation Arrangement by Sharebased Payment Award Options Granted in Period, Fair Value                   $ 207,000
The 2007 Equity Incentive Plan [Member] | Strategic Advisor [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       300,000            
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price       $ 0.67            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares                   25,000
Sharebased Compensation Arrangement by Sharebased Payment Award Options Granted in Period, Fair Value                   $ 15,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number of Shares to Vest Monthly       12,500            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares               175,000    
The 2007 Equity Incentive Plan [Member] | Board Of Directors [Member]                    
Allocated Share-based Compensation Expense, Total   $ 65,000                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   283,526                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price   $ 0.50                
The 2007 Equity Incentive Plan [Member] | Vendors [Member]                    
Allocated Share-based Compensation Expense, Total   $ 56,671                
The 2007 Equity Incentive Plan [Member] | Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years                  
The 2007 Equity Incentive Plan [Member] | Minimum [Member] | Strategic Advisor [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       2 years            
Selling, General and Administrative Expenses [Member]                    
Allocated Share-based Compensation Expense, Total         $ 146,503 $ 6,000 $ 5,060   $ 320,090 280,288
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period           10 years 10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         565,649 21,429 18,071      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price         $ 0.26 $ 0.28 $ 0.28      
Selling, General and Administrative Expenses [Member] | The 2007 Equity Incentive Plan [Member]                    
Allocated Share-based Compensation Expense, Total   $ 20,092                
Selling, General and Administrative Expenses [Member] | The 2007 Equity Incentive Plan [Member] | Chief Financial Officer [Member]                    
Allocated Share-based Compensation Expense, Total                   $ 103,500