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Income Taxes (Details Narrative) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Note 10 - Income Taxes (Details) [Line Items]    
Federal income tax rate 21.00% 21.00%
Valuation allowance, deferred tax asset, increase (decrease), amount $ 2,755,000 $ 276,000
Percentage of cumulative ownership 50.00%  
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]    
Note 10 - Income Taxes (Details) [Line Items]    
Operating loss expiration date Expire in 2018  
Tax credit carryforward, amount $ 1,000,000  
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Note 10 - Income Taxes (Details) [Line Items]    
Operating loss carryforwards $ 50,300,000  
Operating loss expiration date Expire in 2021  
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]    
Note 10 - Income Taxes (Details) [Line Items]    
Operating loss carryforwards $ 6,800,000  
Operating loss expiration date Expire in 2028