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Note 9 - Stock Option and Stock Plans (Details Textual) - USD ($)
12 Months Ended
Sep. 26, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance   4,657,000 [1] 4,945,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   276.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Discount Rate   2.96%    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 1,308,932    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   3 years 273 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   0 0  
Qualified Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 6,000,000      
Stock Option Price, Percent 100.00%      
Stock Option, Exercise Price $ 0.38      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years      
Qualified Options [Member] | Stock Owner With Over 10 Percent Ownership [Member]        
Stock Option, Exercise Price   $ 0.418    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance   500,000    
Qualified Options [Member] | If Option Grantee Owns or Controls Over Ten Percent of Outstanding Stock [Member]        
Stock Option Price, Percent 110.00%      
Stock Option, Exercise Price $ 0.418      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years      
Qualified Options [Member] | Share-based Payment Arrangement, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%      
Qualified Options [Member] | Share-based Payment Arrangement, Tranche One [Member] | Stock Owner With Over 10 Percent Ownership [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   25.00%    
Qualified Options [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Stock Owner With Over 10 Percent Ownership [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   25.00%    
Qualified Options [Member] | Share-based Payment Arrangement, Tranche Three [Member] | Stock Owner With Over 10 Percent Ownership [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   25.00%    
Qualified Options [Member] | Share-based Compensation Award, Tranche Four [Member] | Stock Owner With Over 10 Percent Ownership [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   25.00%    
Nonqualified Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 20,000,000      
Stock Option, Exercise Price $ 0.38      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years      
Nonqualified Options [Member] | Share-based Payment Arrangement, Tranche One [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%      
[1] There is one stock owner over 10% currently holding 500,000 qualified options. The exercise price for this option-holder would be $0.418 with an exercise period of 5 years and a vesting period of 4 years at 25% per year.