Annual report pursuant to Section 13 and 15(d)

11. Income Taxes (Details)

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11. Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]      
Change in valuation allowance   $ 2,326,000 $ 2,088,000
Targeted deferred tax asset amount, after valuation allowance recorded   0  
Change in ownership limit, operating loss   207,000  
Pre change net operating loss carryforward   6,000,000  
Liability for uncertain tax positions   0  
Accrued interest and penalties   0  
Effect of tax rate changes on deferred tax assets and liabilities   0 $ 7,657,000
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax assets, valuation allowance   7,657,000  
State And Local Jurisdiction [Member]      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards   $ 51,000,000  
State And Local Jurisdiction [Member] | Earliest Tax Year [Member]      
Operating Loss Carryforwards [Line Items]      
Tax years subject to examination   2006  
Domestic Country [Member]      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards   $ 51,000,000  
Domestic Country [Member] | Earliest Tax Year [Member]      
Operating Loss Carryforwards [Line Items]      
Tax years subject to examination   2006  
Scenario Plan [Member]      
Operating Loss Carryforwards [Line Items]      
U. S. corporate income tax rate 21.00%